A007482 - cp's OEIS frontend

A007482 a(n) is the number of subsequences of [ 1, ..., 2n ] in which each odd number has an even neighbor.

n	a(n)
0	1
1	3
2	11
3	39
4	139
5	495
6	1763
7	6279
8	22363
9	79647
10	283667
11	1010295
12	3598219
13	12815247
14	45642179
15	162557031
16	578955451
17	2061980415
18	7343852147
19	26155517271
20	93154256107
21	331773802863
22	1181629920803
23	4208437368135

[1, 3, 11, 39, 139, 495, 1763, 6279, 22363, 79647, 283667, 1010295, 3598219, 12815247, 45642179, 162557031, 578955451, 2061980415, 7343852147, 26155517271, 93154256107, 331773802863, 1181629920803, 4208437368135]

cp's OEIS Frontend

A007482 a(n) is the number of subsequences of [ 1, ..., 2n ] in which each odd number has an even neighbor.

Table of values

List of values