A108246 - cp's OEIS frontend

A108246 Number of labeled 2-regular graphs with no multiple edges, but loops are allowed (i.e., each vertex is endpoint of two (usual) edges or one loop).

n	a(n)
0	1
1	1
2	1
3	2
4	8
5	38
6	208
7	1348
8	10126
9	86174
10	819134
11	8604404
12	98981944
13	1237575268
14	16710431992
15	242337783032
16	3756693451772
17	61991635990652
18	1084943597643964
19	20072853005524696
20	391443701509660096
21	8024999955144721256
22	172544980412641191776

[1, 1, 1, 2, 8, 38, 208, 1348, 10126, 86174, 819134, 8604404, 98981944, 1237575268, 16710431992, 242337783032, 3756693451772, 61991635990652, 1084943597643964, 20072853005524696, 391443701509660096, 8024999955144721256, 172544980412641191776]

cp's OEIS Frontend

A108246 Number of labeled 2-regular graphs with no multiple edges, but loops are allowed (i.e., each vertex is endpoint of two (usual) edges or one loop).

Table of values

List of values