Number of (n+2) X 3 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..1 introduced in row major order.
A205257
Number of (n+2) X 3 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..1 introduced in row major order.
Terms
- a(0) =240a(1) =1814a(2) =13728a(3) =103876a(4) =785920a(5) =5946280a(6) =44989988a(7) =340397184a(8) =2575465940a(9) =19486134776a(10) =147433307220
External references
- oeis: A205257