Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically, diagonally or antidiagonally, and top left element zero.
A233019
Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically, diagonally or antidiagonally, and top left element zero.
Terms
- a(0) =1a(1) =15a(2) =849a(3) =179999a(4) =149128385a(5) =487651369463
External references
- oeis: A233019