A069722 - cp's OEIS frontend

A069722 Number of rooted unicursal planar maps with n edges and exactly one vertex of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).

n	a(n)
1	0
2	4
3	24
4	160
5	1120
6	8064
7	59136
8	439296
9	3294720
10	24893440
11	189190144
12	1444724736
13	11076222976
14	85201715200
15	657270374400
16	5082890895360
17	39392404439040
18	305870434467840
19	2378992268083200
20	18531097667174400
21	144542561803960320
22	1128808577897594880

[0, 4, 24, 160, 1120, 8064, 59136, 439296, 3294720, 24893440, 189190144, 1444724736, 11076222976, 85201715200, 657270374400, 5082890895360, 39392404439040, 305870434467840, 2378992268083200, 18531097667174400, 144542561803960320, 1128808577897594880]

cp's OEIS Frontend

A069722 Number of rooted unicursal planar maps with n edges and exactly one vertex of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).

Table of values

List of values