| public static catalanNumber ( integer $n ) : integer | ||
| $n | integer | |
| Результат | integer | number |
public static function catalanNumber(int $n)
{
if ($n < 0) {
throw new Exception\OutOfBoundsException('Cannot compute negative catalan number.');
}
return 1 / ($n + 1) * self::centralBinomialCoefficient($n);
}