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%I #7 Apr 20 2020 00:05:32
%S 1,3,7,29,140,635,2853,19993,75825,786161,2915241,49663915,152854596,
%T 4893607560,13149908952,764803558904,1748158857032,193883417013099,
%U 378301363005384,78801036106269590,130887347815375440
%N Number of n X n 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A302163.
%H R. H. Hardin, <a href="/A302157/b302157.txt">Table of n, a(n) for n = 1..22</a>
%e Some solutions for n=5
%e ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..0..1. .0..0..1..1..0
%e ..0..1..0..1..1. .1..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
%e ..0..1..0..1..0. .0..1..0..1..1. .1..1..0..1..0. .0..1..0..1..0
%e ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..1
%e ..0..1..0..0..1. .0..1..0..1..0. .0..1..0..0..1. .0..1..0..1..0
%Y Cf. A302163.
%K nonn
%O 1,2
%A _R. H. Hardin_, Apr 02 2018
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