Number of 3Xn 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302681

Number of 3Xn 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =4a(2) =8a(3) =12a(4) =18a(5) =40a(6) =94a(7) =184a(8) =358a(9) =760a(10) =1594a(11) =3220a(12) =6574a(13) =13636a(14) =28078a(15) =57460a(16) =118090a(17) =243232a(18) =499846a(19) =1026496a(20) =2110462a(21) =4339696a(22) =8918722a(23) =18329596a(24) =37680070a(25) =77455324a(26) =159200278a(27) =327229276a(28) =672635458a(29) =1382602264

External references