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

A302636

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

Terms

    a(0) =4a(1) =6a(2) =8a(3) =14a(4) =25a(5) =47a(6) =83a(7) =150a(8) =269a(9) =488a(10) =876a(11) =1581a(12) =2845a(13) =5133a(14) =9242a(15) =16661a(16) =30012a(17) =54094a(18) =97457a(19) =175631a(20) =316451a(21) =570258a(22) =1027529a(23) =1851592a(24) =3336392a(25) =6012049a(26) =10833241a(27) =19520945a(28) =35175378a(29) =63384029

External references