A110711 - cp's OEIS frontend

A110711 Number of linear arrangements of n blue, n red and n green items such that first and last elements have the same color but there are no adjacent items of the same color.

n	a(n)
1	0
2	6
3	42
4	288
5	1992
6	13980
7	99432
8	715344
9	5196336
10	38056284
11	280658100
12	2082218160
13	15528409920
14	116331315360
15	874985339760
16	6604555554720
17	50010373864416
18	379760762209692
19	2891169309592548
20	22062102167330592

[0, 6, 42, 288, 1992, 13980, 99432, 715344, 5196336, 38056284, 280658100, 2082218160, 15528409920, 116331315360, 874985339760, 6604555554720, 50010373864416, 379760762209692, 2891169309592548, 22062102167330592]

cp's OEIS Frontend

A110711 Number of linear arrangements of n blue, n red and n green items such that first and last elements have the same color but there are no adjacent items of the same color.

Table of values

List of values