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

A302311

Number of 3 X n 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) =4a(1) =6a(2) =13a(3) =26a(4) =48a(5) =121a(6) =275a(7) =600a(8) =1296a(9) =2998a(10) =6731a(11) =15022a(12) =33412a(13) =75480a(14) =169232a(15) =379265a(16) =848913a(17) =1907065a(18) =4276079a(19) =9589159a(20) =21494910a(21) =48224727a(22) =108142434a(23) =242526545a(24) =543834226a(25) =1219737296a(26) =2735350513a(27) =6134430103a(28) =13756843652a(29) =30852213480

External references