1/120 the number of (n+1) X 3 0..4 arrays with every 2 X 2 subblock containing four distinct values.
A183615
1/120 the number of (n+1) X 3 0..4 arrays with every 2 X 2 subblock containing four distinct values.
Terms
- a(0) =6a(1) =56a(2) =528a(3) =4992a(4) =47232a(5) =446976a(6) =4230144a(7) =40034304a(8) =378888192a(9) =3585835008a(10) =33936703488a(11) =321180401664
External references
- oeis: A183615