A350225 - cp's OEIS frontend

A350225 Number of ordered pairs (a,g) with a in IS_n the symmetric inverse semigroup on [n] and g in symmetric group on [n] such that ag=ga.

n	a(n)
0	1
1	2
2	10
3	60
4	480
5	4320
6	46800
7	554400
8	7459200
9	108864000
10	1745452800
11	30017433600
12	558036864000
13	11021826816000
14	232330146048000
15	5173159799808000
16	121812482727936000
17	3012672515973120000
18	78301030421053440000
19	2127572806150471680000
20	60438151687124090880000

[1, 2, 10, 60, 480, 4320, 46800, 554400, 7459200, 108864000, 1745452800, 30017433600, 558036864000, 11021826816000, 232330146048000, 5173159799808000, 121812482727936000, 3012672515973120000, 78301030421053440000, 2127572806150471680000, 60438151687124090880000]

cp's OEIS Frontend

A350225 Number of ordered pairs (a,g) with a in IS_n the symmetric inverse semigroup on [n] and g in symmetric group on [n] such that ag=ga.

Table of values

List of values