Number of 4Xn 0..2 arrays with exactly floor(4Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
A223107
Number of 4Xn 0..2 arrays with exactly floor(4Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
Terms
- a(0) =0a(1) =280a(2) =13416a(3) =737254a(4) =40395409a(5) =2222762597a(6) =123093376161
External references
- oeis: A223107