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

A302461

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

Terms

    a(0) =4a(1) =2a(2) =18a(3) =8a(4) =44a(5) =56a(6) =140a(7) =364a(8) =764a(9) =2352a(10) =5612a(11) =16144a(12) =42324a(13) =116260a(14) =314408a(15) =853216a(16) =2319700a(17) =6290064a(18) =17095288a(19) =46394920a(20) =126019004a(21) =342168972a(22) =929215108a(23) =2523394628a(24) =6852508984a(25) =18609263140a(26) =50535852808a(27) =137239321084a(28) =372695225548

External references