Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 4 neighboring 1s.

A297763

Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 4 neighboring 1s.

Terms

    a(0) =1a(1) =2a(2) =12a(3) =31a(4) =78a(5) =225a(6) =733a(7) =2305a(8) =7156a(9) =22388a(10) =70737a(11) =223576a(12) =705927a(13) =2229237a(14) =7044181a(15) =22263130a(16) =70360408a(17) =222365159a(18) =702781362a(19) =2221173901a(20) =7020142785a(21) =22187534409a(22) =70124998492a(23) =221634512416a(24) =700490315089

External references