A141146 - cp's OEIS frontend

A141146 Number of linear arrangements of n blue, n red and n green items such that first and last elements are blue but there are no adjacent items of the same color.

n	a(n)
1	0
2	2
3	14
4	96
5	664
6	4660
7	33144
8	238448
9	1732112
10	12685428
11	93552700
12	694072720
13	5176136640
14	38777105120
15	291661779920
16	2201518518240
17	16670124621472
18	126586920736564
19	963723103197516
20	7354034055776864
21	56236603567496720

[0, 2, 14, 96, 664, 4660, 33144, 238448, 1732112, 12685428, 93552700, 694072720, 5176136640, 38777105120, 291661779920, 2201518518240, 16670124621472, 126586920736564, 963723103197516, 7354034055776864, 56236603567496720]

cp's OEIS Frontend

A141146 Number of linear arrangements of n blue, n red and n green items such that first and last elements are blue but there are no adjacent items of the same color.

Table of values

List of values