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A297727 Number of nXn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s. 0

%I

%S 1,2,17,93,2719,65215,6241242,959915987,322119198752,199728169017008

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

%C Diagonal of A297733.

%e Some solutions for n=6

%e ..0..0..1..1..1..0. .0..0..1..0..1..0. .1..1..0..1..1..1. .0..1..1..0..0..0

%e ..1..1..0..0..0..1. .0..1..1..1..0..1. .1..1..0..0..1..0. .1..0..0..1..1..1

%e ..1..1..1..0..1..1. .0..0..0..0..1..0. .0..0..0..1..0..1. .0..1..1..0..1..0

%e ..1..0..0..0..1..0. .1..1..0..1..0..1. .1..1..0..0..1..0. .1..1..1..1..0..1

%e ..0..1..1..0..0..1. .1..1..0..0..1..1. .1..1..0..1..0..1. .1..0..0..1..1..1

%e ..0..0..0..1..1..0. .0..0..0..0..1..1. .0..0..0..0..1..0. .0..1..1..0..1..0

%Y Cf. A297733.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 04 2018

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Last modified July 23 16:10 EDT 2019. Contains 325258 sequences. (Running on oeis4.)