A002527 - cp's OEIS frontend

A002527 Number of permutations p on the set [n] with the properties that abs(p(i)-i) <= 3 for all i and p(1) <= 3.

n	a(n)
0	0
1	1
2	2
3	6
4	18
5	60
6	184
7	560
8	1695
9	5200
10	15956
11	48916
12	149664
13	458048
14	1402360
15	4294417
16	13149210
17	40259178
18	123260854
19	377395940
20	1155508592
21	3537919648
22	10832298239
23	33165996032
24	101546731816
25	310913195800
26	951945967120
27	2914642812096
28	8923975209168

[0, 1, 2, 6, 18, 60, 184, 560, 1695, 5200, 15956, 48916, 149664, 458048, 1402360, 4294417, 13149210, 40259178, 123260854, 377395940, 1155508592, 3537919648, 10832298239, 33165996032, 101546731816, 310913195800, 951945967120, 2914642812096, 8923975209168]

cp's OEIS Frontend

A002527 Number of permutations p on the set [n] with the properties that abs(p(i)-i) <= 3 for all i and p(1) <= 3.

Table of values

List of values