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%I #4 Mar 30 2018 12:31:31
%S 0,13,15,74,468,2036,10982,53440,271596,1360466,6832459,34345485,
%T 172485648,866676017,4353899691,21873626234,109891360736,552080909728,
%U 2773601514082,13934283247296,70004406947220,351694969884786
%N Number of 4Xn 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
%C Row 4 of A301999.
%H R. H. Hardin, <a href="/A302001/b302001.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..1..1..0. .0..0..1..1..0
%e ..0..0..0..0..0. .1..1..1..0..0. .0..0..1..0..1. .0..0..1..0..0
%e ..1..1..0..1..1. .1..0..1..1..1. .0..1..0..1..0. .0..1..1..0..1
%e ..1..1..1..0..0. .0..1..0..0..0. .1..0..1..0..0. .0..0..0..1..1
%Y Cf. A301999.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 30 2018
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