Number of n X n symmetric 0..4 arrays with no element equal to the difference mod 5 of any two of its horizontal and vertical neighbors.

A193809

Number of n X n symmetric 0..4 arrays with no element equal to the difference mod 5 of any two of its horizontal and vertical neighbors.

Terms

    a(0) =5a(1) =52a(2) =496a(3) =7536a(4) =224792a(5) =13949968a(6) =1780090736a(7) =465161983824

External references