Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.
A283780
Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.
Terms
- a(0) =0a(1) =14a(2) =625a(3) =10910a(4) =174447a(5) =2510456a(6) =33933330a(7) =439118692a(8) =5498459845a(9) =67121993862a(10) =802882295057
External references
- oeis: A283780