A304628 - cp's OEIS frontend

A304628 a(n) = [x^n] Product_{k>=1} ((1 + x^k)/(1 + x^(4*k)))^n.

n	a(n)
0	1
1	1
2	3
3	13
4	47
5	181
6	729
7	2948
8	12031
9	49540
10	205153
11	853546
12	3565505
13	14943839
14	62810786
15	264650683
16	1117486463
17	4727486583
18	20032950744
19	85017558081
20	361289789377
21	1537198394570
22	6547611493822
23	27917246924099
24	119141276756545
25	508884954441331
26	2175284934712217
27	9305217981192748

[1, 1, 3, 13, 47, 181, 729, 2948, 12031, 49540, 205153, 853546, 3565505, 14943839, 62810786, 264650683, 1117486463, 4727486583, 20032950744, 85017558081, 361289789377, 1537198394570, 6547611493822, 27917246924099, 119141276756545, 508884954441331, 2175284934712217, 9305217981192748]

cp's OEIS Frontend

A304628 a(n) = [x^n] Product_{k>=1} ((1 + x^k)/(1 + x^(4*k)))^n.

Table of values

List of values