Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
A223053
Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =0a(1) =4a(2) =44a(3) =508a(4) =6918a(5) =93770a(6) =1302140a(7) =18203855a(8) =255963118a(9) =3621617164a(10) =51457102852a(11) =733976768254
External references
- oeis: A223053