A208236 - cp's OEIS frontend

A208236 G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (1 + nkx) / (1 + x + nkx^2).

n	a(n)
0	1
1	1
2	1
3	4
4	10
5	50
6	208
7	1290
8	7456
9	55982
10	411796
11	3650514
12	32484460
13	332970374
14	3468625588
15	40420787250
16	481757564956
17	6295577910182
18	84407459209876
19	1223095585594674
20	18208380720893980
21	289843786627539014
22	4741844351895315028
23	82269590167564595250

[1, 1, 1, 4, 10, 50, 208, 1290, 7456, 55982, 411796, 3650514, 32484460, 332970374, 3468625588, 40420787250, 481757564956, 6295577910182, 84407459209876, 1223095585594674, 18208380720893980, 289843786627539014, 4741844351895315028, 82269590167564595250]

cp's OEIS Frontend

A208236 G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (1 + nkx) / (1 + x + nkx^2).

Table of values

List of values

cp's OEIS Frontend

A208236 G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (1 + n*k*x) / (1 + x + n*k*x^2).

Table of values

List of values

A208236 G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (1 + nkx) / (1 + x + nkx^2).