Number of 4Xn 0..1 arrays with every element equal to 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301825

Number of 4Xn 0..1 arrays with every element equal to 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =13a(2) =8a(3) =68a(4) =299a(5) =1351a(6) =6653a(7) =30441a(8) =146175a(9) =682879a(10) =3234177a(11) =15226483a(12) =71859897a(13) =338825989a(14) =1598126524a(15) =7536923120a(16) =35546600366a(17) =167645751951a(18) =790663538862

External references