%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