Christmas Tree in zsh

christmas.zsh

#!/bin/zsh
#
# Creating a nice christmas tree in zsh
#
# 1. Save this file as christmas.zsh
# 2. $ chmod +x christmas.zsh
# 3. ./christmas.zsh 10
#

COUNT=$1
let num_stars=1

let half="$COUNT"
for i in `seq 1 $COUNT`
do
    spaces=""
    for left in `seq 1 $half`; do spaces="$spaces " done

    stars=""
    for j in `seq 1 $num_stars`; do stars="${stars}*" done

    echo "${spaces}${stars}"

    let half="$half - 1"
    let num_stars="${num_stars} + 2"
done