A210438 - cp's OEIS frontend

A210438 G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k^2 + x) / (1 + k^2*x + x^2).

n	a(n)
0	1
1	1
2	4
3	20
4	174
5	2262
6	40894
7	980590
8	30095022
9	1149982990
10	53521460958
11	2980006437662
12	195562339712590
13	14936971352026094
14	1313606920832545022
15	131776096083434471678
16	14956389843996883667182
17	1906794751364126563388238
18	271321222225812454677233694

[1, 1, 4, 20, 174, 2262, 40894, 980590, 30095022, 1149982990, 53521460958, 2980006437662, 195562339712590, 14936971352026094, 1313606920832545022, 131776096083434471678, 14956389843996883667182, 1906794751364126563388238, 271321222225812454677233694]

cp's OEIS Frontend

A210438 G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k^2 + x) / (1 + k^2*x + x^2).

Table of values

List of values