A060639 - cp's OEIS frontend

A060639 Number of pairs of partitions of [n] whose join is the partition {{1,2,...,n}}.

n	a(n)
0	1
1	1
2	3
3	15
4	119
5	1343
6	19905
7	369113
8	8285261
9	219627683
10	6746244739
11	236561380795
12	9356173080985
13	413251604702069
14	20215438754502217
15	1087524296159855603
16	63950948621703499839
17	4089003767746536828183
18	282970817307108139386841
19	21107742616278461624923449
20	1690957890908364634072451893

[1, 1, 3, 15, 119, 1343, 19905, 369113, 8285261, 219627683, 6746244739, 236561380795, 9356173080985, 413251604702069, 20215438754502217, 1087524296159855603, 63950948621703499839, 4089003767746536828183, 282970817307108139386841, 21107742616278461624923449, 1690957890908364634072451893]

cp's OEIS Frontend

A060639 Number of pairs of partitions of [n] whose join is the partition {{1,2,...,n}}.

Table of values

List of values