A141147 - cp's OEIS frontend

A141147 Number of linear arrangements of n blue, n red and n green items such that the first item is blue and there are no adjacent items of the same color (first and last elements considered as adjacent).

n	a(n)
1	2
2	8
3	44
4	268
5	1732
6	11624
7	80096
8	562748
9	4013396
10	28964128
11	211054120
12	1550226880
13	11463513440
14	85257846080
15	637243586944
16	4783617720892
17	36046416801268
18	272543202174704
19	2066898899119448
20	15717398604230888

[2, 8, 44, 268, 1732, 11624, 80096, 562748, 4013396, 28964128, 211054120, 1550226880, 11463513440, 85257846080, 637243586944, 4783617720892, 36046416801268, 272543202174704, 2066898899119448, 15717398604230888]

cp's OEIS Frontend

A141147 Number of linear arrangements of n blue, n red and n green items such that the first item is blue and there are no adjacent items of the same color (first and last elements considered as adjacent).

Table of values

List of values