A007481 - cp's OEIS frontend

A007481 Number of subsequences of [ 1,...,n ] in which each even number has an odd neighbor.

n	a(n)
0	1
1	2
2	3
3	7
4	11
5	25
6	39
7	89
8	139
9	317
10	495
11	1129
12	1763
13	4021
14	6279
15	14321
16	22363
17	51005
18	79647
19	181657
20	283667
21	646981
22	1010295
23	2304257
24	3598219
25	8206733
26	12815247
27	29228713
28	45642179
29	104099605
30	162557031
31	370756241
32	578955451
33	1320467933

[1, 2, 3, 7, 11, 25, 39, 89, 139, 317, 495, 1129, 1763, 4021, 6279, 14321, 22363, 51005, 79647, 181657, 283667, 646981, 1010295, 2304257, 3598219, 8206733, 12815247, 29228713, 45642179, 104099605, 162557031, 370756241, 578955451, 1320467933]

cp's OEIS Frontend

A007481 Number of subsequences of [ 1,...,n ] in which each even number has an odd neighbor.

Table of values

List of values