Number of lower triangles of an n X n 0..3 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less.
A195227
Number of lower triangles of an n X n 0..3 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less.
Terms
- a(0) =4a(1) =22a(2) =246a(3) =5428a(4) =237818a(5) =20729610a(6) =3601738548
External references
- oeis: A195227