A318132 - cp's OEIS frontend

A318132 Number of non-isomorphic set-systems (finite sets of finite nonempty sets) with union {1,2,...,n} and intersection {}.

n	a(n)
0	1
1	0
2	2
3	26
4	1884
5	18660728
6	12813206113141264
7	33758171486592987125648226573752576
8	1435913805026242504952006868879460423733630400489039411798068453617852416

[1, 0, 2, 26, 1884, 18660728, 12813206113141264, 33758171486592987125648226573752576, 1435913805026242504952006868879460423733630400489039411798068453617852416]

cp's OEIS Frontend

A318132 Number of non-isomorphic set-systems (finite sets of finite nonempty sets) with union {1,2,...,n} and intersection {}.

Table of values

List of values