A069732 - cp's OEIS frontend

A069732 Number of nonisomorphic unrooted unicursal planar maps with n edges and no vertices of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).

n	a(n)
1	0
2	0
3	2
4	7
5	40
6	239
7	1549
8	10396
9	71467
10	498598
11	3520015
12	25087426
13	180249182
14	1304148015
15	9494015372
16	69492950976
17	511147940104
18	3776180492129
19	28007532925171
20	208474866181148

[0, 0, 2, 7, 40, 239, 1549, 10396, 71467, 498598, 3520015, 25087426, 180249182, 1304148015, 9494015372, 69492950976, 511147940104, 3776180492129, 28007532925171, 208474866181148]

cp's OEIS Frontend

A069732 Number of nonisomorphic unrooted unicursal planar maps with n edges and no 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