A350468 a(n) = hypergeom([1/2 - n/2, -n/2], [-n], -56).

1, 1, 15, 29, 239, 645, 3991, 13021, 68895, 251189, 1215719, 4732365, 21752431, 88005541, 392539575, 1624617149, 7120171199, 29864811285, 129547208071, 547654566061, 2361315479055, 10028479403909, 43086896110679, 183485607765405, 786702153314911, 3355500662030581

Offset: 0

Author

Peter Luschny, Mar 19 2022

Keywords

• nonn

Crossrefs

a(n) = A350470(7, n).

Programs

Mathematica

Table[HypergeometricPFQ[{1/2 - n/2, -n/2}, {-n}, -56], {n, 0, 30}] (* Vaclav Kotesovec, Feb 18 2024 *)

Formula

a(n) ~ (1 + sqrt(57))^(n+1) / (sqrt(57) * 2^(n+1)). - Vaclav Kotesovec, Feb 18 2024