Number of n X n symmetric 0..3 arrays with no element equal to the product mod 4 of any two of its horizontal and vertical neighbors.
A193500
Number of n X n symmetric 0..3 arrays with no element equal to the product mod 4 of any two of its horizontal and vertical neighbors.
Terms
- a(0) =4a(1) =30a(2) =476a(3) =16922a(4) =1328430a(5) =224738251a(6) =82830799570
External references
- oeis: A193500