| public static centralBinomialCoefficient ( integer $n ) : integer | ||
| $n | integer | |
| Результат | integer | number |
public static function centralBinomialCoefficient(int $n)
{
if ($n < 0) {
throw new Exception\OutOfBoundsException('Cannot compute negative central binomial coefficient.');
}
$⟮2n⟯！ = self::factorial(2 * $n);
$⟮n！⟯² = self::factorial($n) ** 2;
return $⟮2n⟯！ / $⟮n！⟯²;
}