Number of 3Xn 0..1 arrays with every element equal to 0, 1, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A303198

Number of 3Xn 0..1 arrays with every element equal to 0, 1, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =6a(2) =12a(3) =23a(4) =43a(5) =105a(6) =233a(7) =479a(8) =968a(9) =2146a(10) =4683a(11) =9928a(12) =20709a(13) =44652a(14) =96244a(15) =205631a(16) =435063a(17) =930935a(18) =1994977a(19) =4266607a(20) =9080728a(21) =19396626a(22) =41471567a(23) =88657284a(24) =189124509a(25) =403873550a(26) =862832200a(27) =1843730503a(28) =3936307111a(29) =8406314159

External references