A260081 - cp's OEIS frontend

A260081 Number of permutations p of [n] with no fixed points and cyclic displacement of elements restricted by three: p(i)<>i and (i-p(i) mod n <= 3 or p(i)-i mod n <= 3).

n	a(n)
0	1
1	0
2	1
3	2
4	9
5	44
6	265
7	1854
8	4752
9	12072
10	30500
11	76038
12	190656
13	481318
14	1224852
15	3117528
16	7944464
17	20283046
18	51912320
19	133129054
20	341972624
21	879678624
22	2266157892
23	5846150862
24	15101728320
25	39058470566
26	101135401556
27	262158219552
28	680253580304
29	1766843951390

[1, 0, 1, 2, 9, 44, 265, 1854, 4752, 12072, 30500, 76038, 190656, 481318, 1224852, 3117528, 7944464, 20283046, 51912320, 133129054, 341972624, 879678624, 2266157892, 5846150862, 15101728320, 39058470566, 101135401556, 262158219552, 680253580304, 1766843951390]

cp's OEIS Frontend

A260081 Number of permutations p of [n] with no fixed points and cyclic displacement of elements restricted by three: p(i)<>i and (i-p(i) mod n <= 3 or p(i)-i mod n <= 3).

Table of values

List of values