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

A302164

Number of 2Xn 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) =2a(1) =3a(2) =9a(3) =17a(4) =25a(5) =65a(6) =185a(7) =385a(8) =649a(9) =1489a(10) =3929a(11) =8609a(12) =15913a(13) =34545a(14) =85497a(15) =191809a(16) =377545a(17) =802961a(18) =1894553a(19) =4279521a(20) =8785769a(21) =18612785a(22) =42501945a(23) =95817857a(24) =202153993a(25) =429672401a(26) =960801241a(27) =2153871393a(28) =4621792425a(29) =9879318897

External references