A078700 - cp's OEIS frontend

A078700 Number of symmetric ways to lace a shoe that has n pairs of eyelets such that each eyelet has at least one direct connection to the opposite side.

n	a(n)
1	1
2	2
3	6
4	30
5	192
6	1560
7	15120
8	171360
9	2217600
10	32296320
11	522547200
12	9300614400
13	180583603200
14	3798482688000
15	86044973414400
16	2088355965696000
17	54064489070592000
18	1487129136869376000
19	43312058119249920000

[1, 2, 6, 30, 192, 1560, 15120, 171360, 2217600, 32296320, 522547200, 9300614400, 180583603200, 3798482688000, 86044973414400, 2088355965696000, 54064489070592000, 1487129136869376000, 43312058119249920000]

cp's OEIS Frontend

A078700 Number of symmetric ways to lace a shoe that has n pairs of eyelets such that each eyelet has at least one direct connection to the opposite side.

Table of values

List of values