A240936 - cp's OEIS frontend

A240936 Number of ways to partition the (vertex) set {1,2,...,n} into any number of classes and then select some unordered pairs (edges) such that a and b are in distinct classes of the partition.

n	a(n)
0	1
1	1
2	3
3	21
4	337
5	11985
6	930241
7	155643329
8	55638770689
9	42200814258433
10	67536939792143361
11	227017234854393949185
12	1596674435594864988020737
13	23421099407847007850007154689
14	714530983411175509576743561314305
15	45227689798343820164634911814524846081

[1, 1, 3, 21, 337, 11985, 930241, 155643329, 55638770689, 42200814258433, 67536939792143361, 227017234854393949185, 1596674435594864988020737, 23421099407847007850007154689, 714530983411175509576743561314305, 45227689798343820164634911814524846081]

cp's OEIS Frontend

A240936 Number of ways to partition the (vertex) set {1,2,...,n} into any number of classes and then select some unordered pairs (edges) such that a and b are in distinct classes of the partition.

Table of values

List of values