Number of n X n symmetric 0..4 arrays with each element equal to the sum mod 5 of two of its horizontal and vertical neighbors.
A193121
Number of n X n symmetric 0..4 arrays with each element equal to the sum mod 5 of two of its horizontal and vertical neighbors.
Terms
- a(0) =0a(1) =1a(2) =25a(3) =1061a(4) =200989a(5) =167167273a(6) =476648665905
External references
- oeis: A193121