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).
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).
Terms
- a(0) =2a(1) =8a(2) =44a(3) =268a(4) =1732a(5) =11624a(6) =80096a(7) =562748a(8) =4013396a(9) =28964128a(10) =211054120a(11) =1550226880a(12) =11463513440a(13) =85257846080a(14) =637243586944
External references
- oeis: A141147