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(Edit -1 byte - Thanks user59178 - your solution is even better)
for($c=substr(bcdiv(1,$a=$argv[1],$a),2);for(;$i<$a;)$s+=($a-$i)*$c[$i++];echo$s;
$c=substr(bcdiv(1,$a=$argv[1],$a),2);for(;$i<$a;)$s+=($a-$i)*$c[$i++];echo$s;
for($c=substr(bcdiv(1,$a=$argv[1],$a),2);$i<$a;)$s+=($a-$i)*$c[$i++];echo$s;
