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%I #4 Aug 13 2018 14:20:30
%S 1,3,9,69,580,7728,204645,10928383,1157058721,226601121228
%N Number of nXn 0..1 arrays with every element unequal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A318037.
%e Some solutions for n=5
%e ..0..0..0..1..0. .0..0..1..0..1. .0..0..1..0..1. .0..1..0..0..0
%e ..1..0..0..1..1. .0..0..1..0..0. .0..0..1..0..0. .0..1..1..0..1
%e ..1..1..0..0..0. .1..0..1..1..1. .0..1..1..1..1. .1..0..1..1..0
%e ..1..1..0..1..1. .0..0..1..0..0. .0..0..0..0..0. .0..0..0..1..1
%e ..1..0..1..0..0. .0..1..0..1..1. .0..1..1..0..0. .0..0..1..0..0
%Y Cf. A318037.
%K nonn
%O 1,2
%A _R. H. Hardin_, Aug 13 2018
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