Number of n X 2 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element.

A283488

Number of n X 2 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element.

Terms

    a(0) =0a(1) =0a(2) =2a(3) =12a(4) =64a(5) =312a(6) =1460a(7) =6624a(8) =29394a(9) =128264a(10) =552384a(11) =2353888a(12) =9943896a(13) =41703328a(14) =173822258a(15) =720671156a(16) =2974187392a(17) =12224902712a(18) =50069348140a(19) =204417445696a(20) =832198630882

External references