Number of nX4 0..6 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..6 introduced in row major order.
A209461
Number of nX4 0..6 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..6 introduced in row major order.
Terms
- a(0) =15a(1) =700a(2) =107472a(3) =26142922a(4) =8012278798
External references
- oeis: A209461