Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.
A209905
Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.
Terms
- a(0) =62a(1) =13098a(2) =16664508a(3) =135833193008
External references
- oeis: A209905