%I #4 Aug 06 2018 12:09:28
%S 1,3,5,10,19,40,75,159,310,600,1117,2146,4102,7866,14925,28415,54123,
%T 103279,196740,374715,713672,1359955,2591227,4936722,9404444,17916937,
%U 34135626,65035274
%N Number of nXn 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A317773.
%e Some solutions for n=5
%e ..0..0..0..0..0. .0..0..0..1..1. .0..0..1..1..1. .0..0..0..0..0
%e ..0..0..0..0..0. .0..0..0..0..1. .0..0..0..1..1. .0..0..0..0..0
%e ..0..0..0..0..0. .1..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0
%e ..1..0..0..0..0. .1..1..0..0..0. .0..0..0..0..0. .0..0..0..0..0
%e ..1..1..0..0..0. .1..1..1..0..0. .1..0..0..0..0. .0..0..0..0..0
%Y Cf. A317773.
%K nonn
%O 1,2
%A _R. H. Hardin_, Aug 06 2018