Number of linear arrangements of n blue, n red and n green items such that there are no adjacent items of the same color (first and last elements considered as adjacent).
A110707
Number of linear arrangements of n blue, n red and n green items such that there are no adjacent items of the same color (first and last elements considered as adjacent).
Terms
- a(0) =6a(1) =24a(2) =132a(3) =804a(4) =5196a(5) =34872a(6) =240288a(7) =1688244a(8) =12040188a(9) =86892384a(10) =633162360a(11) =4650680640a(12) =34390540320a(13) =255773538240
External references
- oeis: A110707