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

A297721

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

Terms

    a(0) =1a(1) =10a(2) =34a(3) =83a(4) =258a(5) =865a(6) =2651a(7) =8041a(8) =25114a(9) =78356a(10) =242335a(11) =750668a(12) =2331147a(13) =7233125a(14) =22428585a(15) =69571574a(16) =215837630a(17) =669523807a(18) =2076792418a(19) =6442276953a(20) =19984194983a(21) =61990893369a(22) =192295766302a(23) =596503969480

External references