Number of 3Xn 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A303315

Number of 3Xn 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =4a(2) =12a(3) =17a(4) =24a(5) =67a(6) =158a(7) =298a(8) =595a(9) =1337a(10) =2863a(11) =5840a(12) =12231a(13) =26168a(14) =55140a(15) =115193a(16) =242621a(17) =512713a(18) =1078852a(19) =2267487a(20) =4776110a(21) =10063518a(22) =21181387a(23) =44579665a(24) =93874659a(25) =197672892a(26) =416137435a(27) =876080072a(28) =1844597384a(29) =3883701257

External references