One quarter the number of nX7 1..4 arrays with no two neighbors of any element equal to each other.
A183359
One quarter the number of nX7 1..4 arrays with no two neighbors of any element equal to each other.
Terms
- a(0) =972a(1) =36864a(2) =34992a(3) =63504a(4) =137088a(5) =331776a(6) =829440a(7) =1806336a(8) =3852288a(9) =8294400a(10) =18137088a(11) =40144896a(12) =88897536a(13) =196448256a(14) =433465344a(15) =955551744a(16) =2106667008a(17) =4645785600a(18) =10246588416a(19) =22600912896a(20) =49849804800a(21) =109947949056
External references
- oeis: A183359