Number of nX3 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302158

Number of nX3 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =9a(2) =7a(3) =17a(4) =31a(5) =57a(6) =111a(7) =265a(8) =527a(9) =1065a(10) =2431a(11) =4953a(12) =10095a(13) =22537a(14) =46527a(15) =95417a(16) =209679a(17) =436585a(18) =900191a(19) =1955353a(20) =4093999a(21) =8480457a(22) =18265087a(23) =38377337a(24) =79802575a(25) =170819881a(26) =359693471a(27) =750304217a(28) =1598909295a(29) =3371088777

External references