A293045 - cp's OEIS frontend

A293045 Number of odd permutations s of {1,2,...,n} such that |s(i)-i| > 1 for each i=1,2,...,n.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	2
6	15
7	102
8	854
9	7852
10	79867
11	890348
12	10799874
13	141647368
14	1997815108
15	30156348228
16	485117044074
17	8285798537070
18	149759338727585
19	2855791585334774
20	57300933786123530
21	1206811729692494152
22	26619251746350630597
23	613691499376088985144

[0, 0, 0, 0, 0, 2, 15, 102, 854, 7852, 79867, 890348, 10799874, 141647368, 1997815108, 30156348228, 485117044074, 8285798537070, 149759338727585, 2855791585334774, 57300933786123530, 1206811729692494152, 26619251746350630597, 613691499376088985144]

cp's OEIS Frontend

A293045 Number of odd permutations s of {1,2,...,n} such that |s(i)-i| > 1 for each i=1,2,...,n.

Table of values

List of values