A174469 - cp's OEIS frontend

A174469 Number of permutations p of {1,...,n} satisfying p(1)=1 and, if n>1, |p(i)-p((i mod n)+1)| is in {2,3} for i from 1 to n.

n	a(n)
1	1
2	0
3	0
4	0
5	2
6	0
7	0
8	0
9	0
10	2
11	2
12	2
13	2
14	2
15	4
16	6
17	8
18	10
19	12
20	16
21	22
22	30
23	40
24	52
25	68
26	90
27	120
28	160
29	212
30	280
31	370
32	490
33	650
34	862
35	1142
36	1512
37	2002
38	2652
39	3514
40	4656
41	6168
42	8170
43	10822
44	14336
45	18992
46	25160
47	33330
48	44152
49	58488
50	77480
51	102640
52	135970

[1, 0, 0, 0, 2, 0, 0, 0, 0, 2, 2, 2, 2, 2, 4, 6, 8, 10, 12, 16, 22, 30, 40, 52, 68, 90, 120, 160, 212, 280, 370, 490, 650, 862, 1142, 1512, 2002, 2652, 3514, 4656, 6168, 8170, 10822, 14336, 18992, 25160, 33330, 44152, 58488, 77480, 102640, 135970]

cp's OEIS Frontend

A174469 Number of permutations p of {1,...,n} satisfying p(1)=1 and, if n>1, |p(i)-p((i mod n)+1)| is in {2,3} for i from 1 to n.

Table of values

List of values