A225573 - cp's OEIS frontend

A225573 Number of trees over all forests of labeled rooted trees in which some (possibly all or none) of the trees have been specially designated.

n	a(n)
0	0
1	2
2	12
3	90
4	864
5	10290
6	147456
7	2480058
8	48000000
9	1052307234
10	25798901760
11	699896958618
12	20826335158272
13	674680957031250
14	23643898043695104
15	891412022961534330
16	35982083287879778304
17	1548474957047229426498
18	70778880000000000000000

[0, 2, 12, 90, 864, 10290, 147456, 2480058, 48000000, 1052307234, 25798901760, 699896958618, 20826335158272, 674680957031250, 23643898043695104, 891412022961534330, 35982083287879778304, 1548474957047229426498, 70778880000000000000000]

cp's OEIS Frontend

A225573 Number of trees over all forests of labeled rooted trees in which some (possibly all or none) of the trees have been specially designated.

Table of values

List of values