Bash script to crawl the OEIS database, and get the number of entries for each integer. See http://swarminglogic.com/articles/2013_08_oeis for more information.

getoeis.sh

#!/bin/bash

[[ ! "$1" == "-" && ! "$1" == "+" ]] && echo "Invalid sign paramter [-|+]" && exit;
[[ "$1" == "-" ]] && suff="neg";
[[ "$1" == "+" ]] && suff="pos";

cntfile='cntfile_'$suff
[[ ! -e $cntfile ]] && echo '0' > $cntfile;

file='values_'$suff
last=`cat $cntfile`
sign="$1"

function getnfreq() {
    v=`curl --silent "http://oeis.org/search?q=$1" \
         | grep -P '\d result(s|\s)'               \
         | head -n1                                \
         | sed 's/.*Found\s//g'                    \
         | sed 's/.*of\s//g'                       \
         | sed 's/\s.*//g'`
    [[ ! $v ]] && echo 0 || echo $v
}

cnt=0
while [[ true ]]
do
    ((++cnt))
    if [[ $cnt%100 -eq 0 ]] ; then notify-send "OEIS: $last (-)" ; fi

    init0=$last
    init1=$((last+1))
    init2=$((last+2))
    init3=$((last+3))
    init4=$((last+4))
    init5=$((last+5))
    init6=$((last+6))
    init7=$((last+7))
    init8=$((last+8))
    init9=$((last+9))

    (getnfreq $sign$init0 > ./tmpval-0) && echo -n ' [0]' &
    (getnfreq $sign$init1 > ./tmpval-1) && echo -n ' [1]' &
    (getnfreq $sign$init2 > ./tmpval-2) && echo -n ' [2]' &
    (getnfreq $sign$init3 > ./tmpval-3) && echo -n ' [3]' &
    (getnfreq $sign$init4 > ./tmpval-4) && echo -n ' [4]' &
    (getnfreq $sign$init5 > ./tmpval-5) && echo -n ' [5]' &
    (getnfreq $sign$init6 > ./tmpval-6) && echo -n ' [6]' &
    (getnfreq $sign$init7 > ./tmpval-7) && echo -n ' [7]' &
    (getnfreq $sign$init8 > ./tmpval-8) && echo -n ' [8]' &
    (getnfreq $sign$init9 > ./tmpval-9) && echo -n ' [9]' &

    wait $(jobs -p)
    # I.e. make sure no other jobs are running before starting

    echo "";
    echo $init0 `cat ./tmpval-0` >> $file
    echo $init1 `cat ./tmpval-1` >> $file
    echo $init2 `cat ./tmpval-2` >> $file
    echo $init3 `cat ./tmpval-3` >> $file
    echo $init4 `cat ./tmpval-4` >> $file
    echo $init5 `cat ./tmpval-5` >> $file
    echo $init6 `cat ./tmpval-6` >> $file
    echo $init7 `cat ./tmpval-7` >> $file
    echo $init8 `cat ./tmpval-8` >> $file
    echo $init9 `cat ./tmpval-9` >> $file

    echo $sign$init0 `cat ./tmpval-0`
    echo $sign$init1 `cat ./tmpval-1`
    echo $sign$init2 `cat ./tmpval-2`
    echo $sign$init3 `cat ./tmpval-3`
    echo $sign$init4 `cat ./tmpval-4`
    echo $sign$init5 `cat ./tmpval-5`
    echo $sign$init6 `cat ./tmpval-6`
    echo $sign$init7 `cat ./tmpval-7`
    echo $sign$init8 `cat ./tmpval-8`
    echo $sign$init9 `cat ./tmpval-9`

    rm tmpval-*;
    last=$((init9 + 1))
    echo $last > $cntfile
done