Number of lower triangles of an n X n 0..4 array with no element differing from any of its horizontal or vertical neighbors by more than one.
A194927
Number of lower triangles of an n X n 0..4 array with no element differing from any of its horizontal or vertical neighbors by more than one.
Terms
- a(0) =5a(1) =35a(2) =557a(3) =19379a(4) =1481501a(5) =248381815a(6) =91397735301
External references
- oeis: A194927