A230682 - cp's OEIS frontend

A230682 O.g.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k^2 + x)/(1 + k^2*x).

n	a(n)
0	1
1	1
2	4
3	21
4	181
5	2320
6	41581
7	991821
8	30339364
9	1156828681
10	53761779721
11	2990342767680
12	196097039232121
13	14969727522159481
14	1315952342285654884
15	131970189920614495581
16	14974773731779775857021
17	1908770813250950767227280
18	271560466483540753565395621

[1, 1, 4, 21, 181, 2320, 41581, 991821, 30339364, 1156828681, 53761779721, 2990342767680, 196097039232121, 14969727522159481, 1315952342285654884, 131970189920614495581, 14974773731779775857021, 1908770813250950767227280, 271560466483540753565395621]

cp's OEIS Frontend

A230682 O.g.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k^2 + x)/(1 + k^2*x).

Table of values

List of values