A319884 - cp's OEIS frontend

A319884 Number of unordered pairs of set partitions of {1,...,n} where every block of one is a proper subset or proper superset of some block of the other.

n	a(n)
0	1
1	0
2	1
3	7
4	50
5	481
6	5667
7	78058
8	1238295
9	22314627
10	451354476
11	10148011215
12	251584513215
13	6831141750512
14	201976943666357
15	6470392653260939
16	223595676728884394
17	8302299221314559877
18	330075531021130110015
19	14006780163088113914026
20	632606447496264724088803

[1, 0, 1, 7, 50, 481, 5667, 78058, 1238295, 22314627, 451354476, 10148011215, 251584513215, 6831141750512, 201976943666357, 6470392653260939, 223595676728884394, 8302299221314559877, 330075531021130110015, 14006780163088113914026, 632606447496264724088803]

cp's OEIS Frontend

A319884 Number of unordered pairs of set partitions of {1,...,n} where every block of one is a proper subset or proper superset of some block of the other.

Table of values

List of values