A160300 Numerator of Hermite(n, 2/31).

1, 4, -1906, -23000, 10897996, 220415984, -103848077624, -2957229437984, 1385343118601360, 51011732312847424, -23759618336314935584, -1075483968398187231616, 498023914992777619190464, 26797057907106900786753280, -12336437308381113989945920384

Offset: 0

Author

N. J. A. Sloane, Nov 12 2009

Keywords

• sign
• frac

Examples

			Numerators of 1, 4/31, -1906/961, -23000/29791, 10897996/923521, ...
		

Links

• G. C. Greubel, Table of n, a(n) for n = 0..368

Crossrefs

Cf. A009975 (denominators).

Programs

Magma

[Numerator((&+[(-1)^k*Factorial(n)*(4/31)^(n-2*k)/( Factorial(k) *Factorial(n-2*k)): k in [0..Floor(n/2)]])): n in [0..30]]; // G. C. Greubel, Oct 04 2018

Mathematica

Table[31^n*HermiteH[n, 2/31], {n, 0, 30}] (* G. C. Greubel, Oct 04 2018 *)

Maxima

makelist(num(hermite(n, 2/31)), n, 0, 20); /* Bruno Berselli, Mar 28 2018 */

PARI

a(n)=numerator(polhermite(n, 2/31)) \\ Charles R Greathouse IV, Jan 29 2016

PARI

x='x+O('x^30); Vec(serlaplace(exp(4*x - 961*x^2))) \\ G. C. Greubel, Oct 04 2018

Formula

a(n+2) = 4*a(n+1) - 1922*(n+1)*a(n). - Bruno Berselli, Mar 28 2018

From G. C. Greubel, Oct 04 2018: (Start)

a(n) = 31^n * Hermite(n, 2/31).

E.g.f.: exp(4*x - 961*x^2).

a(n) = numerator(Sum_{k=0..floor(n/2)} (-1)^k*n!*(4/31)^(n-2*k)/(k!*(n-2*k)!)). (End)