Number of n X n 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order.
A206686
Number of n X n 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order.
Terms
- a(0) =1a(1) =4a(2) =44a(3) =916a(4) =31504a(5) =1915580a(6) =208563912a(7) =41832855136
External references
- oeis: A206686