Number of n X 2 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
A198522
Number of n X 2 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
Terms
- a(0) =2a(1) =15a(2) =193a(3) =3660a(4) =81844a(5) =1948672a(6) =47436498a(7) =1163606279a(8) =28617909415a(9) =704465305625
External references
- oeis: A198522