Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A303183

Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =25a(2) =31a(3) =72a(4) =170a(5) =382a(6) =873a(7) =2013a(8) =4618a(9) =10598a(10) =24347a(11) =55915a(12) =128406a(13) =294906a(14) =677293a(15) =1555481a(16) =3572366a(17) =8204410a(18) =18842487a(19) =43274223a(20) =99384898a(21) =228250358a(22) =524206673a(23) =1203908917a(24) =2764933650a(25) =6350030286a(26) =14583671731a(27) =33493301843a(28) =76921730606

External references