Number of n X 2 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements.

A283094

Number of n X 2 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements.

Terms

    a(0) =0a(1) =0a(2) =6a(3) =28a(4) =142a(5) =606a(6) =2458a(7) =9520a(8) =35678a(9) =130398a(10) =467036a(11) =1645468a(12) =5718204a(13) =19641544a(14) =66795854a(15) =225191264a(16) =753433522a(17) =2503868506a(18) =8271225942a(19) =27176203312a(20) =88858110366a(21) =289261952058a(22) =937867756728

External references