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%I
%S 0,233,499,1394,110036,729297,15243860,204666568,2933712940,
%T 44201068772,631467436258,9310616032492,135219892970154,
%U 1977188363830961,28827781254085548,420748594948205104,6138969205830064789
%N Number of 7Xn 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
%C Row 7 of A301999.
%H R. H. Hardin, <a href="/A302004/b302004.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=5
%e ..0..0..1..1..0. .0..0..1..1..0. .0..0..0..0..1. .0..0..0..1..1
%e ..0..1..0..0..0. .0..0..0..0..0. .1..1..1..1..1. .1..1..1..0..0
%e ..1..1..0..1..1. .1..1..0..1..1. .0..0..1..0..0. .0..0..1..1..0
%e ..1..0..1..1..1. .1..1..0..0..1. .0..1..1..0..1. .0..0..1..0..1
%e ..0..0..1..0..0. .0..0..0..1..1. .0..0..0..1..1. .0..0..0..1..1
%e ..1..1..1..1..1. .0..1..0..1..1. .1..1..0..1..1. .1..1..0..0..0
%e ..1..0..0..0..0. .1..0..0..0..0. .1..0..0..0..0. .1..0..1..1..1
%Y Cf. A301999.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 30 2018
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