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

A302428

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

Terms

    a(0) =4a(1) =6a(2) =11a(3) =21a(4) =38a(5) =88a(6) =188a(7) =377a(8) =735a(9) =1557a(10) =3288a(11) =6781a(12) =13628a(13) =28203a(14) =58716a(15) =121753a(16) =248505a(17) =511788a(18) =1057997a(19) =2191020a(20) =4502367a(21) =9272331a(22) =19120457a(23) =39518063a(24) =81408758a(25) =167766247a(26) =345763679a(27) =713697958a(28) =1471345608a(29) =3033391563

External references