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%I #7 Apr 20 2020 00:01:55
%S 1,5,12,32,82,205,508,1258,3129,7837,19782,50310,128803,331592,857434,
%T 2224726,5787130,15082283,39360630,102820286,268777679,702935723,
%U 1839002254,4812250428,12594535285,32965703404,86292668280,225894991484
%N Number of n X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A301790.
%H R. H. Hardin, <a href="/A301785/b301785.txt">Table of n, a(n) for n = 1..36</a>
%e Some solutions for n=5
%e ..0..1..1..0..1. .0..1..1..0..0. .0..1..0..1..0. .0..1..1..0..1
%e ..0..0..1..0..0. .0..0..1..1..0. .0..1..0..1..0. .0..0..1..0..1
%e ..1..0..1..1..0. .1..0..0..1..1. .0..1..0..1..0. .1..0..1..0..1
%e ..1..0..0..1..1. .1..1..0..0..1. .0..1..0..1..0. .1..0..1..0..0
%e ..1..1..0..0..1. .0..1..1..0..1. .0..1..0..1..0. .1..0..1..1..0
%Y Cf. A301790.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 26 2018
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