A261584 - cp's OEIS frontend

A261584 Expansion of Product_{k>=1} (1 + 2x^k)/(1 - 2x^k).

n	a(n)
0	1
1	4
2	12
3	36
4	92
5	228
6	540
7	1236
8	2748
9	6004
10	12876
11	27252
12	57036
13	118308
14	243564
15	498564
16	1015484
17	2060484
18	4167804
19	8409588
20	16934748
21	34049940
22	68378220
23	137185428
24	275026476
25	551052676
26	1103618508
27	2209525092
28	4422484764
29	8850120420
30	17707920924

[1, 4, 12, 36, 92, 228, 540, 1236, 2748, 6004, 12876, 27252, 57036, 118308, 243564, 498564, 1015484, 2060484, 4167804, 8409588, 16934748, 34049940, 68378220, 137185428, 275026476, 551052676, 1103618508, 2209525092, 4422484764, 8850120420, 17707920924]

cp's OEIS Frontend

A261584 Expansion of Product_{k>=1} (1 + 2x^k)/(1 - 2x^k).

Table of values

List of values

cp's OEIS Frontend

A261584 Expansion of Product_{k>=1} (1 + 2*x^k)/(1 - 2*x^k).

Table of values

List of values

A261584 Expansion of Product_{k>=1} (1 + 2x^k)/(1 - 2x^k).