A144259 - cp's OEIS frontend

A144259 Number of forests of trees on n or fewer nodes using a subset of labels 1..n, also row sums of triangle A144258.

n	a(n)
0	1
1	2
2	5
3	17
4	83
5	577
6	5425
7	65221
8	959145
9	16703045
10	336294539
11	7687013743
12	196668883339
13	5568107204467
14	172833125462925
15	5836126964882633
16	212987232417299345
17	8353651173273885025
18	350415859403143234243
19	15654265239209850186247
20	741991467954126579131811

[1, 2, 5, 17, 83, 577, 5425, 65221, 959145, 16703045, 336294539, 7687013743, 196668883339, 5568107204467, 172833125462925, 5836126964882633, 212987232417299345, 8353651173273885025, 350415859403143234243, 15654265239209850186247, 741991467954126579131811]

cp's OEIS Frontend

A144259 Number of forests of trees on n or fewer nodes using a subset of labels 1..n, also row sums of triangle A144258.

Table of values

List of values