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%I #4 Mar 28 2018 11:03:15
%S 64,610,2841,7883,31173,240222,1454613,7734317,39492565,231010966,
%T 1368292090,7943126611,45394661195,264505253778,1552587576944,
%U 9114661439887,53464193088001,314087978745270,1846947051770084
%N Number of 7Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
%C Row 7 of A301884.
%H R. H. Hardin, <a href="/A301890/b301890.txt">Table of n, a(n) for n = 1..155</a>
%e Some solutions for n=5
%e ..0..1..0..1..0. .0..1..0..1..0. .0..0..1..0..1. .0..0..1..0..1
%e ..0..1..0..1..0. .0..1..1..0..0. .1..1..1..1..1. .1..1..1..0..1
%e ..0..0..0..1..0. .0..1..0..1..0. .0..1..0..0..0. .0..0..1..0..1
%e ..1..1..0..0..1. .0..1..0..1..0. .0..1..0..1..0. .1..1..1..0..1
%e ..0..1..0..0..1. .0..1..1..1..0. .0..1..0..1..0. .0..0..1..0..1
%e ..0..0..1..0..1. .0..0..0..1..0. .1..0..1..0..1. .1..1..1..1..1
%e ..0..1..0..1..0. .0..1..1..1..0. .1..0..1..0..0. .0..1..0..0..1
%Y Cf. A301884.
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 28 2018