Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A303192

Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =9a(2) =12a(3) =23a(4) =62a(5) =122a(6) =305a(7) =793a(8) =1757a(9) =4500a(10) =11625a(11) =27164a(12) =68288a(13) =174229a(14) =418787a(15) =1042345a(16) =2631836a(17) =6422387a(18) =15922406a(19) =39917606a(20) =98193097a(21) =243159537a(22) =606853585a(23) =1499009192a(24) =3711839149a(25) =9238182444a(26) =22867354964a(27) =56640304965a(28) =140740151139

External references