PATHS by ninjalj

<?for(;$n=fgets(STDIN);print"$t\x0d
"){$v=$n*$t=2;while(--$v>$n)$t=bcmul($t,$v);while(--$v)$t=bcdiv($t,$v);}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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