One quarter the number of n X n toroidal 0..3 arrays with each element having the sum of its vertical neighbors equal to the sum of its horizontal neighbors.
A184100
One quarter the number of n X n toroidal 0..3 arrays with each element having the sum of its vertical neighbors equal to the sum of its horizontal neighbors.
Terms
- a(0) =1a(1) =4a(2) =85a(3) =484a(4) =3661a(5) =28900a(6) =137845a(7) =1322500
External references
- oeis: A184100