A266819 - cp's OEIS frontend

A266819 Expansion of Product_{k>=1} ((1 + x^k) * (1 + 2*x^k)).

n	a(n)
0	1
1	3
2	5
3	12
4	20
5	33
6	60
7	93
8	144
9	222
10	340
11	498
12	729
13	1050
14	1486
15	2115
16	2946
17	4068
18	5592
19	7608
20	10278
21	13854
22	18483
23	24528
24	32426
25	42594
26	55677
27	72498
28	94008
29	121290
30	156002
31	199842
32	255012
33	324438
34	411318
35	519771
36	655128
37	823056
38	1031148
39	1288590
40	1605945

[1, 3, 5, 12, 20, 33, 60, 93, 144, 222, 340, 498, 729, 1050, 1486, 2115, 2946, 4068, 5592, 7608, 10278, 13854, 18483, 24528, 32426, 42594, 55677, 72498, 94008, 121290, 156002, 199842, 255012, 324438, 411318, 519771, 655128, 823056, 1031148, 1288590, 1605945]

cp's OEIS Frontend

A266819 Expansion of Product_{k>=1} ((1 + x^k) * (1 + 2*x^k)).

Table of values

List of values