A143405 - cp's OEIS frontend

A143405 Number of forests of labeled rooted trees of height at most 1, with n labels, where any root may contain >= 1 labels, also row sums of A143395, A143396 and A143397.

n	a(n)
0	1
1	1
2	4
3	17
4	89
5	552
6	3895
7	30641
8	265186
9	2497551
10	25373097
11	276105106
12	3199697517
13	39297401197
14	509370849148
15	6943232742493
16	99217486649933
17	1482237515573624
18	23093484367004715
19	374416757914118941
20	6304680593346141746
21	110063311977033807187

[1, 1, 4, 17, 89, 552, 3895, 30641, 265186, 2497551, 25373097, 276105106, 3199697517, 39297401197, 509370849148, 6943232742493, 99217486649933, 1482237515573624, 23093484367004715, 374416757914118941, 6304680593346141746, 110063311977033807187]

cp's OEIS Frontend

A143405 Number of forests of labeled rooted trees of height at most 1, with n labels, where any root may contain >= 1 labels, also row sums of A143395, A143396 and A143397.

Table of values

List of values