<?phpfunction oddprod( $l, $h ){ $p = 1; !( $l % 2 ) or $l++; !( $h % 2 ) or $h++; while( $l <= $h ) { $p *= $l; $l += 2; } return $p;}function factorial( $n ){ $f = 1; for( $i = 1; $i < $n; $i++ ) $f *= oddprod( 3, 2 ** ($i + 1) - 1 ); return 2 ** (2 ** $n - 1) * $f;}print factorial( 15 );
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