A000270 - cp's OEIS frontend

A000270 For n >= 2, a(n) = b(n+1)+b(n)+b(n-1), where the b(i) are the ménage numbers A000179; a(0)=a(1)=1.

n	a(n)
0	1
1	1
2	0
3	3
4	16
5	95
6	672
7	5397
8	48704
9	487917
10	5373920
11	64547175
12	839703696
13	11762247419
14	176509466560
15	2825125339305
16	48040633506048
17	864932233294681
18	16436901752820288
19	328791893988472843
20	6905593482159150480
21	151941269284478380119
22	3495011687269591273312

[1, 1, 0, 3, 16, 95, 672, 5397, 48704, 487917, 5373920, 64547175, 839703696, 11762247419, 176509466560, 2825125339305, 48040633506048, 864932233294681, 16436901752820288, 328791893988472843, 6905593482159150480, 151941269284478380119, 3495011687269591273312]

cp's OEIS Frontend

A000270 For n >= 2, a(n) = b(n+1)+b(n)+b(n-1), where the b(i) are the ménage numbers A000179; a(0)=a(1)=1.

Table of values

List of values