A268560 - cp's OEIS frontend

A268560 Number of bicolored maps defined by immersions of unoriented circle into oriented sphere with n double points with edges labeled 1..2n such that labels of successive edges along the curve (starting at any edge, going in the direction determined by the coloring) are encountered in pairs of the form {2m-1, 2*m} (in either order).

n	a(n)
1	2
2	16
3	336
4	12480
5	689664
6	51440640
7	4870932480
8	561752432640
9	76597275525120
10	12077498082263040
11	2164587437201817600
12	434984457687426662400
13	96927605985557820211200
14	23730144990202925206732800
15	6333914501366616792288460800
16	1831049666989439061980086272000

[2, 16, 336, 12480, 689664, 51440640, 4870932480, 561752432640, 76597275525120, 12077498082263040, 2164587437201817600, 434984457687426662400, 96927605985557820211200, 23730144990202925206732800, 6333914501366616792288460800, 1831049666989439061980086272000]

cp's OEIS Frontend

Table of values

List of values