A177260 - cp's OEIS frontend

A177260 Number of derangements of {1,2,...,n} having no adjacent 4-cycles (an adjacent 4-cycle is a cycle of the form (i,i+1,i+2,i+3)).

n	a(n)
0	1
1	0
2	1
3	2
4	8
5	44
6	262
7	1846
8	14789
9	133232
10	1333112
11	14669758
12	176081478
13	2289458896
14	32056423888
15	480890367598
16	7694774125983
17	130818028518432
18	2354820682603399
19	44743035640567412
20	894883797133726171
21	18792952193893804872
22	413452012727711517437

[1, 0, 1, 2, 8, 44, 262, 1846, 14789, 133232, 1333112, 14669758, 176081478, 2289458896, 32056423888, 480890367598, 7694774125983, 130818028518432, 2354820682603399, 44743035640567412, 894883797133726171, 18792952193893804872, 413452012727711517437]

cp's OEIS Frontend

A177260 Number of derangements of {1,2,...,n} having no adjacent 4-cycles (an adjacent 4-cycle is a cycle of the form (i,i+1,i+2,i+3)).

Table of values

List of values