Number of nX2 0..1 arrays with no 1 equal to more than two of its horizontal and vertical neighbors.

A283124

Number of nX2 0..1 arrays with no 1 equal to more than two of its horizontal and vertical neighbors.

Terms

    a(0) =4a(1) =16a(2) =57a(3) =209a(4) =768a(5) =2816a(6) =10329a(7) =37889a(8) =138980a(9) =509792a(10) =1869969a(11) =6859233a(12) =25160352a(13) =92290688a(14) =338531473a(15) =1241767297a(16) =4554926628a(17) =16707926384a(18) =61286344841a(19) =224804441777a(20) =824605173856

External references