function tribonacci(n: number): number { return Math.round(Math.pow(X, n) * Y);}const SQ33 = Math.sqrt(33);const AP = Math.cbrt(19 + 3 * SQ33);const AN = Math.cbrt(19 - 3 * SQ33);const B = Math.cbrt(586 + 102 * SQ33);const X = (AP + AN + 1) / 3;const Y = (3 * B) / (B * B - 2 * B + 4);export default tribonacci;