A273654 - cp's OEIS frontend

A273654 Number of forests of labeled rooted trees of height at most 1, with n labels, four of which are used for root nodes and any root may contain >= 1 labels.

n	a(n)
4	15
5	185
6	1485
7	9905
8	59850
9	341082
10	1872990
11	10032990
12	52814025
13	274436305
14	1411449039
15	7195628895
16	36390053700
17	182622509860
18	909578754540
19	4496410556268
20	22062707386875
21	107464431586995
22	519700280676885
23	2495827315731365
24	11905791978208590
25	56429414876395550

[15, 185, 1485, 9905, 59850, 341082, 1872990, 10032990, 52814025, 274436305, 1411449039, 7195628895, 36390053700, 182622509860, 909578754540, 4496410556268, 22062707386875, 107464431586995, 519700280676885, 2495827315731365, 11905791978208590, 56429414876395550]

cp's OEIS Frontend

A273654 Number of forests of labeled rooted trees of height at most 1, with n labels, four of which are used for root nodes and any root may contain >= 1 labels.

Table of values

List of values