A181162 - cp's OEIS frontend

A181162 Number of commuting functions: the number of ordered pairs (f,g) of functions from {1..n} to itself such that fg=gf (i.e., f(g(i))=g(f(i)) for all i).

n	a(n)
0	1
1	1
2	10
3	141
4	2824
5	71565
6	2244096
7	83982199
8	3681265792
9	186047433225
10	10716241342240
11	697053065658411
12	50827694884298784
13	4129325095108122637
14	371782656333674104624
15	36918345387693628911375
16	4025196918605160943576576
17	479796375191949916361466897

[1, 1, 10, 141, 2824, 71565, 2244096, 83982199, 3681265792, 186047433225, 10716241342240, 697053065658411, 50827694884298784, 4129325095108122637, 371782656333674104624, 36918345387693628911375, 4025196918605160943576576, 479796375191949916361466897]

cp's OEIS Frontend

A181162 Number of commuting functions: the number of ordered pairs (f,g) of functions from {1..n} to itself such that fg=gf (i.e., f(g(i))=g(f(i)) for all i).

Table of values

List of values