A053155 - cp's OEIS frontend

A053155 Number of 3-element intersecting families (with not necessarily distinct sets) of an n-element set.

n	a(n)
0	0
1	1
2	7
3	50
4	397
5	3366
6	29197
7	253030
8	2170357
9	18385046
10	153927037
11	1275981510
12	10492253317
13	85727548726
14	696964520077
15	5644579061990
16	45579645264277
17	367223771048406
18	2953549834748317
19	23724145930814470
20	190373553357763237

[0, 1, 7, 50, 397, 3366, 29197, 253030, 2170357, 18385046, 153927037, 1275981510, 10492253317, 85727548726, 696964520077, 5644579061990, 45579645264277, 367223771048406, 2953549834748317, 23724145930814470, 190373553357763237]

cp's OEIS Frontend

A053155 Number of 3-element intersecting families (with not necessarily distinct sets) of an n-element set.

Table of values

List of values