A307323 - cp's OEIS frontend

A307323 Expansion of Product_{j>=1} (1 + (-1 + Product_{k>=1} (1 + x^k)^k)^j)^j.

n	a(n)
0	1
1	1
2	4
3	18
4	74
5	303
6	1206
7	4741
8	18466
9	71463
10	274879
11	1051509
12	4001727
13	15157935
14	57170668
15	214787989
16	804049797
17	2999846236
18	11156943967
19	41370989836
20	152973793900
21	564117250793
22	2074959664189
23	7613615954760
24	27871659379578
25	101805487967357
26	371072295698710

[1, 1, 4, 18, 74, 303, 1206, 4741, 18466, 71463, 274879, 1051509, 4001727, 15157935, 57170668, 214787989, 804049797, 2999846236, 11156943967, 41370989836, 152973793900, 564117250793, 2074959664189, 7613615954760, 27871659379578, 101805487967357, 371072295698710]

cp's OEIS Frontend

A307323 Expansion of Product_{j>=1} (1 + (-1 + Product_{k>=1} (1 + x^k)^k)^j)^j.

Table of values

List of values