Number of n X n 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
A200794
Number of n X n 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =15a(2) =9880a(3) =132636590
External references
- oeis: A200794