Number of 2 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0 or 2 neighboring 1s.

A297458

Number of 2 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0 or 2 neighboring 1s.

Terms

    a(0) =4a(1) =8a(2) =25a(3) =57a(4) =156a(5) =384a(6) =1009a(7) =2545a(8) =6580a(9) =16760a(10) =43081a(11) =110121a(12) =282444a(13) =722928a(14) =1852705a(15) =4744417a(16) =12155236a(17) =31132904a(18) =79753849a(19) =204285465a(20) =523300860a(21) =1340442720a(22) =3433646161a(23) =8795417041a(24) =22530001684a(25) =57711669848a(26) =147831676585

External references