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%I #4 Mar 28 2018 11:01:11
%S 8,34,95,203,510,1754,5463,16452,49611,153498,478314,1488796,4635051,
%T 14448493,45103531,140813098,439606342,1372574192,4286144428,
%U 13385273545,41801527070,130545539541,407696977117,1273260715371,3976480385362
%N Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
%C Row 4 of A301884.
%H R. H. Hardin, <a href="/A301887/b301887.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=5
%e ..0..1..1..1..0. .0..1..0..1..0. .0..0..0..1..0. .0..1..0..1..0
%e ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..1..0..1
%e ..0..0..1..1..0. .1..0..1..0..1. .0..1..0..1..0. .0..1..1..0..1
%e ..0..1..0..1..1. .1..0..1..0..0. .0..1..0..0..0. .1..0..1..1..1
%Y Cf. A301884.
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 28 2018
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