A273661 - cp's OEIS frontend

A273661 Number of forests of labeled rooted trees of height at most 1, with 2n labels, n of which are used for root nodes and any root may contain >= 1 labels.

n	a(n)
0	1
1	2
2	30
3	1040
4	59850
5	5020092
6	568136184
7	82506827832
8	14838761544750
9	3218688299529560
10	824939949711312292
11	245760625104930199992
12	83971523217039191918912
13	32541316683315808775379000
14	14168363320559065768499122200
15	6874922021593176730438764171840

[1, 2, 30, 1040, 59850, 5020092, 568136184, 82506827832, 14838761544750, 3218688299529560, 824939949711312292, 245760625104930199992, 83971523217039191918912, 32541316683315808775379000, 14168363320559065768499122200, 6874922021593176730438764171840]

cp's OEIS Frontend

A273661 Number of forests of labeled rooted trees of height at most 1, with 2n labels, n of which are used for root nodes and any root may contain >= 1 labels.

Table of values

List of values