Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.

A297734

Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =15a(4) =32a(5) =61a(6) =145a(7) =297a(8) =658a(9) =1352a(10) =2975a(11) =6240a(12) =13565a(13) =28609a(14) =61801a(15) =131106a(16) =282136a(17) =600239a(18) =1288448a(19) =2746557a(20) =5887025a(21) =12563881a(22) =26904370a(23) =57460200a(24) =122975935a(25) =262760096a(26) =562158461a(27) =1201484193a(28) =2569940969a(29) =5493595714

External references