Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,4,0,0,1 for x=0,1,2,3,4.
A197091
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,4,0,0,1 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =7a(2) =74a(3) =3477a(4) =457357a(5) =183439730a(6) =227951140324
External references
- oeis: A197091