A260092 - cp's OEIS frontend

A260092 Number of permutations p of [n] with no fixed points and cyclic displacement of elements restricted by four: p(i)<>i and (i-p(i) mod n <= 4 or p(i)-i mod n <= 4).

n	a(n)
0	1
1	0
2	1
3	2
4	9
5	44
6	265
7	1854
8	14833
9	133496
10	440192
11	1445100
12	4728000
13	15405008
14	49955280
15	162442816
16	530284304
17	1738077424
18	5714461760
19	18795784436
20	61868602624
21	203858323008
22	672535917712
23	2221505855492
24	7345985276816
25	24314075406208
26	80542683435168

[1, 0, 1, 2, 9, 44, 265, 1854, 14833, 133496, 440192, 1445100, 4728000, 15405008, 49955280, 162442816, 530284304, 1738077424, 5714461760, 18795784436, 61868602624, 203858323008, 672535917712, 2221505855492, 7345985276816, 24314075406208, 80542683435168]

cp's OEIS Frontend

A260092 Number of permutations p of [n] with no fixed points and cyclic displacement of elements restricted by four: p(i)<>i and (i-p(i) mod n <= 4 or p(i)-i mod n <= 4).

Table of values

List of values