A293043 - cp's OEIS frontend

A293043 Number of odd permutations p of {1,...,n} such that p(i) is not i or i+1.

n	a(n)
0	0
1	0
2	0
3	0
4	2
5	7
6	49
7	336
8	2708
9	24398
10	244298
11	2689664
12	32297990
13	420096141
14	5883813379
15	88287031264
16	1412982765800
17	24026200566396
18	432554403678612
19	8219863859175936
20	164419973194802826
21	3453229295483253843
22	75978854506098366005
23	1747670263607990439472

[0, 0, 0, 0, 2, 7, 49, 336, 2708, 24398, 244298, 2689664, 32297990, 420096141, 5883813379, 88287031264, 1412982765800, 24026200566396, 432554403678612, 8219863859175936, 164419973194802826, 3453229295483253843, 75978854506098366005, 1747670263607990439472]

cp's OEIS Frontend

A293043 Number of odd permutations p of {1,...,n} such that p(i) is not i or i+1.

Table of values

List of values