Solution for Euler numbers

euler.sh

#!/bin/bash
################################################################################
#  Copyright (c) 2011, by Michael Neale. All rights reserved.
#
#  THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MICHAEL NEALE
#
#  The copyright notice above does not evidence any
#  actual or intended publication of such source code.
################################################################################

if [ ! -f eulers ]; then
    wget -q -O eulers http://oeis.org/A028296/b028296.txt
fi

if [ $(( $1 % 2 )) == 1 ]; then
    echo 0
    exit 0
fi

grep "^$(($1 / 2)) " eulers | awk '{print $2}'
if [ $? -ne 0 ]; then
  echo "For additional results you will need to hire me!"
  exit 1
fi