A227635 - cp's OEIS frontend

A227635 G.f.: Sum_{n>=1} x^n * (1+x)^n / (1-x^n).

n	a(n)
1	1
2	3
3	5
4	8
5	12
6	18
7	28
8	42
9	65
10	103
11	160
12	252
13	404
14	644
15	1026
16	1648
17	2654
18	4269
19	6873
20	11086
21	17898
22	28902
23	46681
24	75427
25	121920
26	197116
27	318731
28	515425
29	833593
30	1348316
31	2181023
32	3528149
33	5707571
34	9233632
35	14938484
36	24168539
37	39102325
38	63264687
39	102358843
40	165612728

[1, 3, 5, 8, 12, 18, 28, 42, 65, 103, 160, 252, 404, 644, 1026, 1648, 2654, 4269, 6873, 11086, 17898, 28902, 46681, 75427, 121920, 197116, 318731, 515425, 833593, 1348316, 2181023, 3528149, 5707571, 9233632, 14938484, 24168539, 39102325, 63264687, 102358843, 165612728]

cp's OEIS Frontend

A227635 G.f.: Sum_{n>=1} x^n * (1+x)^n / (1-x^n).

Table of values

List of values