Number of nX4 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.

A283518

Number of nX4 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.

Terms

    a(0) =0a(1) =5a(2) =270a(3) =5988a(4) =113984a(5) =2032993a(6) =34279720a(7) =558718061a(8) =8877675769a(9) =138361189406

External references