A336495 - cp's OEIS frontend

A336495 a(n) = (-1)^n * Sum_{k=0..n} (-2)^k * binomial(n,k) * binomial(n^2+k+1,n)/(n^2+k+1).

n	a(n)
0	1
1	1
2	4
3	34
4	484
5	9946
6	270314
7	9189776
8	376223992
9	18046839982
10	993655820512
11	61803730636506
12	4287521490060780
13	328324625277864008
14	27514775912958768464
15	2505202120094546731584
16	246288599061132553970160
17	26004541628560046316399382
18	2935176211106696031739535696

[1, 1, 4, 34, 484, 9946, 270314, 9189776, 376223992, 18046839982, 993655820512, 61803730636506, 4287521490060780, 328324625277864008, 27514775912958768464, 2505202120094546731584, 246288599061132553970160, 26004541628560046316399382, 2935176211106696031739535696]

cp's OEIS Frontend

A336495 a(n) = (-1)^n * Sum_{k=0..n} (-2)^k * binomial(n,k) * binomial(n^2+k+1,n)/(n^2+k+1).

Table of values

List of values