A143406 - cp's OEIS frontend

A143406 Number of forests of labeled rooted trees of height at most 1, with n labels, where each root contains a nonempty set of labels of equal size, also row sums of A143398.

n	a(n)
0	1
1	1
2	4
3	14
4	55
5	252
6	1319
7	7737
8	50040
9	351636
10	2659375
11	21519027
12	185279186
13	1688183135
14	16206401020
15	163376811610
16	1724624368377
17	19011582728772
18	218312877627483
19	2605840967052663
20	32271957793959066
21	413991491885677105
22	5492584623675060620

[1, 1, 4, 14, 55, 252, 1319, 7737, 50040, 351636, 2659375, 21519027, 185279186, 1688183135, 16206401020, 163376811610, 1724624368377, 19011582728772, 218312877627483, 2605840967052663, 32271957793959066, 413991491885677105, 5492584623675060620]

cp's OEIS Frontend

A143406 Number of forests of labeled rooted trees of height at most 1, with n labels, where each root contains a nonempty set of labels of equal size, also row sums of A143398.

Table of values

List of values