Number of 2Xn 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302310

Number of 2Xn 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =2a(1) =3a(2) =11a(3) =21a(4) =31a(5) =113a(6) =363a(7) =813a(8) =1751a(9) =5001a(10) =14051a(11) =34053a(12) =82063a(13) =218273a(14) =579291a(15) =1452381a(16) =3638471a(17) =9447993a(18) =24526163a(19) =62318133a(20) =158325631a(21) =407598161a(22) =1049289291a(23) =2679681933a(24) =6843284663a(25) =17562012393a(26) =45069368771a(27) =115317418341

External references