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%I #4 Mar 29 2018 12:49:32
%S 0,233,5820,439078,21418808,1427656268,86143630040,5308792667591,
%T 324469928188515,19912146679826809,1220249427475855637,
%U 74810226305531953416,4585754748793488994754,281114995706301373466905
%N Number of 7Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
%C Row 7 of A301951.
%H R. H. Hardin, <a href="/A301956/b301956.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=5
%e ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
%e ..0..0..0..0..0. .0..0..0..0..0. .0..1..0..0..0. .0..0..0..0..0
%e ..1..1..1..0..0. .1..1..1..0..0. .1..0..1..0..0. .1..1..1..1..0
%e ..0..0..1..1..1. .1..1..0..0..0. .0..1..0..0..0. .0..0..0..0..0
%e ..1..1..0..0..1. .1..0..1..1..0. .1..1..1..1..1. .0..1..1..1..1
%e ..1..0..1..1..1. .0..0..0..0..0. .1..1..0..1..1. .1..0..1..0..1
%e ..0..0..0..0..0. .0..0..1..1..1. .1..0..1..1..1. .0..1..0..1..1
%Y Cf. A301951.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 29 2018
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