Number of nX5 0..1 arrays with every element unequal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A318420

Number of nX5 0..1 arrays with every element unequal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =5a(2) =5a(3) =71a(4) =129a(5) =280a(6) =839a(7) =2717a(8) =8803a(9) =25414a(10) =74518a(11) =227494a(12) =702137a(13) =2143691a(14) =6482983a(15) =19639879a(16) =59787428a(17) =182279554a(18) =554882961a(19) =1687253474a(20) =5131113671a(21) =15614188211a(22) =47523441803a(23) =144618256222a(24) =440018989420

External references