%I #9 Jan 27 2024 16:29:10
%S 4,25,68,187,579,1797,5571,17382,54589,171758,541502,1710237,5408966,
%T 17123725,54254138,172005475,545590319,1731242563,5495164970,
%U 17446421788,55400350112,175946894177,558856114250,1775239587936,5639545671984,17916569853876,56922515406874
%N Number of 3 X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C Row 3 of A303016.
%H R. H. Hardin, <a href="/A303017/b303017.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 6*a(n-1) -7*a(n-2) -11*a(n-3) +11*a(n-4) +a(n-5) +49*a(n-6) -12*a(n-7) -59*a(n-8) -61*a(n-9) +23*a(n-10) +89*a(n-11) +28*a(n-12) -24*a(n-13) -44*a(n-14) +12*a(n-15) for n>16.
%e Some solutions for n=5:
%e ..0..1..0..1..1. .0..0..0..1..1. .0..0..1..1..1. .0..0..1..1..1
%e ..1..1..0..1..0. .0..1..0..0..1. .1..0..0..1..0. .1..0..1..0..1
%e ..1..0..0..0..0. .1..1..0..1..0. .1..0..1..0..1. .1..0..1..0..1
%Y Cf. A303016.
%K nonn
%O 1,1
%A _R. H. Hardin_, Apr 17 2018
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