A069725 - cp's OEIS frontend

A069725 Number of nonisomorphic unrooted unicursal planar maps with n edges and two vertices of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).

n	a(n)
1	1
2	1
3	3
4	11
5	62
6	342
7	2152
8	13768
9	91800
10	622616
11	4301792
12	30100448
13	213019072
14	1521473984
15	10954616064
16	79420280064
17	579300888960
18	4248201302400
19	31302536066560
20	231638727063040

[1, 1, 3, 11, 62, 342, 2152, 13768, 91800, 622616, 4301792, 30100448, 213019072, 1521473984, 10954616064, 79420280064, 579300888960, 4248201302400, 31302536066560, 231638727063040]

cp's OEIS Frontend

A069725 Number of nonisomorphic unrooted unicursal planar maps with n edges and two vertices of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).

Table of values

List of values