A320237 - cp's OEIS frontend

A320237 G.f.: Product_{k>=1, j>=1} ((1 + x^(kj)) / (1 - x^(kj)))^2.

n	a(n)
0	1
1	4
2	16
3	52
4	156
5	428
6	1120
7	2772
8	6616
9	15224
10	34032
11	74020
12	157340
13	327244
14	667824
15	1338828
16	2641332
17	5133372
18	9840432
19	18621476
20	34818852
21	64374564
22	117768176
23	213306948
24	382733816
25	680630120
26	1200198784
27	2099417544
28	3644332860
29	6280017740
30	10746594208

[1, 4, 16, 52, 156, 428, 1120, 2772, 6616, 15224, 34032, 74020, 157340, 327244, 667824, 1338828, 2641332, 5133372, 9840432, 18621476, 34818852, 64374564, 117768176, 213306948, 382733816, 680630120, 1200198784, 2099417544, 3644332860, 6280017740, 10746594208]

cp's OEIS Frontend

A320237 G.f.: Product_{k>=1, j>=1} ((1 + x^(kj)) / (1 - x^(kj)))^2.

Table of values

List of values

cp's OEIS Frontend

A320237 G.f.: Product_{k>=1, j>=1} ((1 + x^(k*j)) / (1 - x^(k*j)))^2.

Table of values

List of values

A320237 G.f.: Product_{k>=1, j>=1} ((1 + x^(kj)) / (1 - x^(kj)))^2.