Number of n X 2 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 4 1s.

A295525

Number of n X 2 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 4 1s.

Terms

    a(0) =2a(1) =10a(2) =29a(3) =87a(4) =280a(5) =876a(6) =2735a(7) =8583a(8) =26900a(9) =84274a(10) =264107a(11) =827651a(12) =2593568a(13) =8127490a(14) =25469197a(15) =79812833a(16) =250109752a(17) =783769936a(18) =2456102483a(19) =7696696911a(20) =24119166438a(21) =75582316528a(22) =236852570799a(23) =742225734425

External references