A186081 - cp's OEIS frontend

A186081 Number of binary relations R on {1,2,...,n} such that the transitive closure of R is the trivial relation.

n	a(n)
0	1
1	1
2	4
3	144
4	25696
5	18082560
6	47025585664
7	450955726792704
8	16260917603754029056
9	2253010420928564535951360
10	1219004114245442237742488879104
11	2601909995433633381004133738019815424
12	22040854392120341022554569447470527813779456

[1, 1, 4, 144, 25696, 18082560, 47025585664, 450955726792704, 16260917603754029056, 2253010420928564535951360, 1219004114245442237742488879104, 2601909995433633381004133738019815424, 22040854392120341022554569447470527813779456]

cp's OEIS Frontend

A186081 Number of binary relations R on {1,2,...,n} such that the transitive closure of R is the trivial relation.

Table of values

List of values