A026936 - OEIS

A026936

a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A008288.

1, 14, 131, 1028, 7333, 49362, 319943, 2020552, 12526153, 76603094, 463676491, 2784550604, 16619355501, 98706690714, 583943891087, 3443573355152, 20254044891793, 118871039217822, 696401860980499, 4073713439171732, 23799679604123189, 138895001298962786, 809854583626750039

(list; graph; refs; listen; history; text; internal format)

OFFSET

3,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 3..1000

MATHEMATICA

A008288[n_, k_]:= Binomial[n, k]*Hypergeometric2F1[-k, k-n, -n, -1];

A026936[n_]:= Sum[A008288[n, k]*A008288[n, k+3], {k, 0, n-3}];

Table[A026936[n], {n, 3, 40}] (* G. C. Greubel, May 25 2021 *)

PROG

(Sage)

@CachedFunction