Number of nX4 0..5 arrays with values 0..5 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.
A198623
Number of nX4 0..5 arrays with values 0..5 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =2a(1) =76a(2) =3904a(3) =342414a(4) =38208073a(5) =5040999127a(6) =713917706692
External references
- oeis: A198623