A325890 - cp's OEIS frontend

A325890 Number of colored set partitions of [n] where colors of the elements of subsets are in (weakly) increasing order and exactly two colors are used.

n	a(n)
2	3
3	20
4	122
5	774
6	5247
7	38198
8	298139
9	2485690
10	22045130
11	207125874
12	2053771931
13	21416863948
14	234145149539
15	2676207794512
16	31898152797430
17	395584489687982
18	5093960430643323
19	67985187315217290
20	938835976835478467
21	13394336734762313862
22	197153821757472332126

[3, 20, 122, 774, 5247, 38198, 298139, 2485690, 22045130, 207125874, 2053771931, 21416863948, 234145149539, 2676207794512, 31898152797430, 395584489687982, 5093960430643323, 67985187315217290, 938835976835478467, 13394336734762313862, 197153821757472332126]

cp's OEIS Frontend

A325890 Number of colored set partitions of [n] where colors of the elements of subsets are in (weakly) increasing order and exactly two colors are used.

Table of values

List of values