Number of lower triangles of an n X n 0..3 array with each element differing from all of its horizontal and vertical neighbors by one.
A194993
Number of lower triangles of an n X n 0..3 array with each element differing from all of its horizontal and vertical neighbors by one.
Terms
- a(0) =4a(1) =10a(2) =42a(3) =248a(4) =2290a(5) =31042a(6) =641376a(7) =19753266a(8) =918924546a(9) =64065187024
External references
- oeis: A194993