Half the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.
A209504
Half the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.
Terms
- a(0) =9a(1) =123a(2) =3906a(3) =290493a(4) =50798448a(5) =20934997854
External references
- oeis: A209504