A381539 - cp's OEIS frontend

A381539 Number of permutations of [n] having exactly one pair of integers i in [n] such that their cycle minima have opposite sorting order.

n	a(n)
0	0
1	0
2	0
3	1
4	5
5	21
6	89
7	408
8	2106
9	12529
10	86579
11	691287
12	6296333
13	64454418
14	731532528
15	9101244205
16	122993164505
17	1792140943473
18	27987008885201
19	466072881110268
20	8241676745580774
21	154187446760870761
22	3042028843184493887
23	63114652818792762987
24	1373581948592359961909

[0, 0, 0, 1, 5, 21, 89, 408, 2106, 12529, 86579, 691287, 6296333, 64454418, 731532528, 9101244205, 122993164505, 1792140943473, 27987008885201, 466072881110268, 8241676745580774, 154187446760870761, 3042028843184493887, 63114652818792762987, 1373581948592359961909]

cp's OEIS Frontend

A381539 Number of permutations of [n] having exactly one pair of integers i in [n] such that their cycle minima have opposite sorting order.

Table of values

List of values