%I #4 Mar 25 2018 11:37:38
%S 8,421,5289,71564,1073621,15498505,225780260,3307561389,48158543096,
%T 703127937300,10259186324647,149696614458243,2184338617470806,
%U 31873058777880129,465081902561442941,6786326832276152384
%N Number of nX7 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero.
%C Column 7 of A301669.
%H R. H. Hardin, <a href="/A301668/b301668.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=5
%e ..0..0..0..1..1..0..0. .0..0..1..1..0..0..1. .0..0..0..1..1..0..1
%e ..0..1..1..0..0..1..1. .0..1..0..0..1..0..1. .0..1..0..0..1..0..1
%e ..0..0..1..0..1..0..1. .0..1..0..1..1..0..1. .0..1..1..0..1..1..0
%e ..1..0..1..0..1..0..1. .0..1..0..1..0..0..0. .0..0..0..1..0..1..0
%e ..1..1..0..0..1..0..1. .0..1..0..1..1..0..0. .1..1..0..1..0..1..1
%Y Cf. A301669.
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 25 2018
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