A381545 - cp's OEIS frontend

A381545 Number of permutations of [n] having exactly n pairs of integers i in [n] such that their cycle minima have opposite sorting order.

n	a(n)
0	1
1	0
2	0
3	0
4	0
5	0
6	28
7	239
8	2789
9	24970
10	247089
11	2289028
12	23926282
13	244031780
14	2795283827
15	32671509063
16	426329260855
17	5714045982473
18	86176948036417
19	1327311505233240
20	22831768389870460
21	401597165962560396
22	7782893107559342148
23	153285768850390602735
24	3316598607281771351415

[1, 0, 0, 0, 0, 0, 28, 239, 2789, 24970, 247089, 2289028, 23926282, 244031780, 2795283827, 32671509063, 426329260855, 5714045982473, 86176948036417, 1327311505233240, 22831768389870460, 401597165962560396, 7782893107559342148, 153285768850390602735, 3316598607281771351415]

cp's OEIS Frontend

A381545 Number of permutations of [n] having exactly n pairs of integers i in [n] such that their cycle minima have opposite sorting order.

Table of values

List of values