A368545 a(n) = (6*n)!*(9*n)!/((2*n)!*(3*n)!*((5*n)!)^2).

1, 1512, 13477464, 156037527360, 2018989675062360, 27791880541579666512, 397974308267103144857280, 5857301482132559510090140920, 87960819866039245485380114158680, 1341476995616395775866469804150505600, 20709814202640945368698086671062023292464, 322897098547446926110838713561401344838974976

Offset

0,2

Links

Table of n, a(n) for n=0..11.

Formula

G.f.: hypergeometric10F9([1/9, 1/6, 2/9, 1/3, 4/9, 5/9, 2/3, 7/9, 5/6, 8/9], [1/5, 1/5, 2/5, 2/5, 3/5, 3/5, 4/5, 4/5, 1], (167365651248*z)/9765625).

E.g.f.: hypergeometric10F10([1/9, 1/6, 2/9, 1/3, 4/9, 5/9, 2/3, 7/9, 5/6, 8/9], [1/5, 1/5, 2/5, 2/5, 3/5, 3/5, 4/5, 4/5, 1,1], (167365651248*z)/9765625).

a(n) = Integral_{x=0..167365651248/9765625} x^n*W(x) dx, n>=0, where W(x) = (1953125*MeijerG([[], [-4/5, -4/5, -3/5, -3/5, -2/5, -2/5, -1/5, -1/5, 0, 0]], [[-1/9, -1/6, -2/9, -1/3, -4/9, -5/9, -2/3, -7/9, -5/6, -8/9], []], (9765625*x)/167365651248))/(111577100832*Pi). MeijerG is the Meijer G - function. This integral representation as the n-th power moment of the W(x) function in the interval [0, 167365651248/9765625] is verified by direct integration. However, we are unable at present to determine the geometric shape of W(x).

Maple

seq((6*n)!*(9*n)!/((2*n)!*(3*n)!*((5*n)!)^2), n=0..12);

Crossrefs

Cf. A113424, A368513, A304126.

Sequence in context: A187294 A107523 A282253 * A317477 A064584 A318713

Adjacent sequences: A368542 A368543 A368544 * A368546 A368547 A368548

Keyword

nonn

Author

Karol A. Penson, Dec 29 2023

Status

approved