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

A301907

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

Terms

    a(0) =4a(1) =1a(2) =3a(3) =2a(4) =2a(5) =7a(6) =12a(7) =27a(8) =62a(9) =160a(10) =387a(11) =951a(12) =2362a(13) =5895a(14) =14745a(15) =36892a(16) =92334a(17) =231171a(18) =578926a(19) =1450251a(20) =3633632a(21) =9105130a(22) =22816655a(23) =57178265a(24) =143291478a(25) =359102513a(26) =899959089a(27) =2255439374a(28) =5652518690a(29) =14166233267

External references