A212322 - cp's OEIS frontend

A212322 Number of compositions of n such that no two adjacent parts are equal, and the first part is not equal to the last part if there is more than one part.

n	a(n)
0	1
1	1
2	1
3	3
4	3
5	5
6	13
7	17
8	29
9	55
10	99
11	161
12	293
13	507
14	881
15	1561
16	2727
17	4743
18	8337
19	14579
20	25497
21	44675
22	78173
23	136753
24	239437
25	419077
26	733377
27	1283701
28	2246823
29	3932249
30	6882603
31	12046313
32	21083545
33	36901587
34	64586887
35	113042011
36	197851265
37	346287829
38	606086169

[1, 1, 1, 3, 3, 5, 13, 17, 29, 55, 99, 161, 293, 507, 881, 1561, 2727, 4743, 8337, 14579, 25497, 44675, 78173, 136753, 239437, 419077, 733377, 1283701, 2246823, 3932249, 6882603, 12046313, 21083545, 36901587, 64586887, 113042011, 197851265, 346287829, 606086169]

cp's OEIS Frontend

A212322 Number of compositions of n such that no two adjacent parts are equal, and the first part is not equal to the last part if there is more than one part.

Table of values

List of values