A306020 - cp's OEIS frontend

A306020 a(n) is the number of set-systems using nonempty subsets of {1,...,n} in which all sets have the same size.

n	a(n)
0	1
1	2
2	5
3	16
4	95
5	2110
6	1114237
7	68723671292
8	1180735735906024030715
9	170141183460507917357914971986913657850
10	7237005577335553223087828975127304179197147198604070555943173844710572689401

[1, 2, 5, 16, 95, 2110, 1114237, 68723671292, 1180735735906024030715, 170141183460507917357914971986913657850, 7237005577335553223087828975127304179197147198604070555943173844710572689401]

cp's OEIS Frontend

A306020 a(n) is the number of set-systems using nonempty subsets of {1,...,n} in which all sets have the same size.

Table of values

List of values