A208230 - cp's OEIS frontend

A208230 Number of functions f:{1,2,...,n}->{1,2,...,n} with all cycles of length >= 4.

n	a(n)
0	1
1	0
2	0
3	0
4	6
5	144
6	3000
7	64560
8	1498140
9	37906848
10	1046608416
11	31438821600
12	1023129229320
13	35910464987760
14	1353422643322464
15	54548490915316944
16	2342204085734058000
17	106771822456475695680
18	5151207243866077428480
19	262261296920723111462592
20	14053817061169685865626976

[1, 0, 0, 0, 6, 144, 3000, 64560, 1498140, 37906848, 1046608416, 31438821600, 1023129229320, 35910464987760, 1353422643322464, 54548490915316944, 2342204085734058000, 106771822456475695680, 5151207243866077428480, 262261296920723111462592, 14053817061169685865626976]

cp's OEIS Frontend

A208230 Number of functions f:{1,2,...,n}->{1,2,...,n} with all cycles of length >= 4.

Table of values

List of values