A326961 - cp's OEIS frontend

A326961 Number of set-systems covering n vertices where every vertex is the unique common element of some subset of the edges, also called covering T_1 set-systems.

n	a(n)
0	1
1	1
2	2
3	36
4	19020
5	2010231696
6	9219217412568364176
7	170141181796805105960861096082778425120
8	57896044618658097536026644159052312977171804852352892309392604715987334365792

[1, 1, 2, 36, 19020, 2010231696, 9219217412568364176, 170141181796805105960861096082778425120, 57896044618658097536026644159052312977171804852352892309392604715987334365792]

cp's OEIS Frontend

A326961 Number of set-systems covering n vertices where every vertex is the unique common element of some subset of the edges, also called covering T_1 set-systems.

Table of values

List of values