Number of lower triangles of an n X n 0..2 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less.
A195226
Number of lower triangles of an n X n 0..2 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less.
Terms
- a(0) =3a(1) =15a(2) =155a(3) =3151a(4) =127785a(5) =10322065a(6) =1663418313a(7) =535153390177
External references
- oeis: A195226