A306357 - cp's OEIS frontend

A306357 Number of nonempty subsets of {1, ..., n} containing no three cyclically successive elements.

n	a(n)
0	0
1	1
2	3
3	6
4	10
5	20
6	38
7	70
8	130
9	240
10	442
11	814
12	1498
13	2756
14	5070
15	9326
16	17154
17	31552
18	58034
19	106742
20	196330
21	361108
22	664182
23	1221622
24	2246914
25	4132720
26	7601258
27	13980894
28	25714874
29	47297028
30	86992798
31	160004702
32	294294530
33	541292032
34	995591266
35	1831177830

[0, 1, 3, 6, 10, 20, 38, 70, 130, 240, 442, 814, 1498, 2756, 5070, 9326, 17154, 31552, 58034, 106742, 196330, 361108, 664182, 1221622, 2246914, 4132720, 7601258, 13980894, 25714874, 47297028, 86992798, 160004702, 294294530, 541292032, 995591266, 1831177830]

cp's OEIS Frontend

A306357 Number of nonempty subsets of {1, ..., n} containing no three cyclically successive elements.

Table of values

List of values