Number of n X n 0..2 arrays with values 0..2 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.
A199640
Number of n X n 0..2 arrays with values 0..2 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.
Terms
- a(0) =0a(1) =3a(2) =112a(3) =29229a(4) =32177372a(5) =176701683386
External references
- oeis: A199640