A144164 - cp's OEIS frontend

A144164 Number of simple graphs on n labeled nodes, where each maximally connected subgraph is either a tree or a cycle, also row sums of A144163, A215861.

n	a(n)
0	1
1	1
2	2
3	8
4	45
5	338
6	3304
7	40485
8	602075
9	10576466
10	214622874
11	4941785261
12	127282939615
13	3625467047196
14	113140481638088
15	3838679644895477
16	140681280613912089
17	5538276165405744140
18	233086092164091031114
19	10443453353262112373541
20	496313160155209940833001

[1, 1, 2, 8, 45, 338, 3304, 40485, 602075, 10576466, 214622874, 4941785261, 127282939615, 3625467047196, 113140481638088, 3838679644895477, 140681280613912089, 5538276165405744140, 233086092164091031114, 10443453353262112373541, 496313160155209940833001]

cp's OEIS Frontend

A144164 Number of simple graphs on n labeled nodes, where each maximally connected subgraph is either a tree or a cycle, also row sums of A144163, A215861.

Table of values

List of values