Number of 4Xn 0..1 arrays with every element equal to 0, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301908

Number of 4Xn 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) =8a(1) =1a(2) =7a(3) =5a(4) =8a(5) =40a(6) =96a(7) =316a(8) =1078a(9) =3831a(10) =13331a(11) =46127a(12) =161362a(13) =564617a(14) =1975369a(15) =6914911a(16) =24216868a(17) =84826850a(18) =297130258a(19) =1040826424a(20) =3646117344a(21) =12772898193a(22) =44745724111a(23) =156753135377a(24) =549139791596

External references