Number of nX4 0..1 arrays with every element equal to 0, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A303321

Number of nX4 0..1 arrays with every element equal to 0, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =8a(2) =1a(3) =2a(4) =4a(5) =3a(6) =3a(7) =10a(8) =9a(9) =10a(10) =19a(11) =29a(12) =40a(13) =65a(14) =96a(15) =148a(16) =238a(17) =356a(18) =573a(19) =865a(20) =1381a(21) =2136a(22) =3369a(23) =5245a(24) =8248a(25) =12925a(26) =20251a(27) =31889a(28) =49995a(29) =78599

External references