Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302416

Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =25a(2) =30a(3) =66a(4) =142a(5) =289a(6) =599a(7) =1268a(8) =2660a(9) =5558a(10) =11659a(11) =24470a(12) =51293a(13) =107533a(14) =225522a(15) =472918a(16) =991618a(17) =2079349a(18) =4360310a(19) =9143205a(20) =19172527a(21) =40203428a(22) =84303632a(23) =176778210a(24) =370690543a(25) =777310342a(26) =1629961137a(27) =3417905349a(28) =7167090042

External references