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%I #7 Mar 09 2018 19:33:03
%S 4,18,74,308,1282,5338,22228,92562,385450,1605108,6684066,27834106,
%T 115908116,482670130,2009958090,8369963828,34854604610,145143215386,
%U 604412335444,2516922821842,10481090672106,43645860224116
%N Number of n X 3 arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..1 n X 3 array.
%C Column 3 of A218064.
%H R. H. Hardin, <a href="/A218059/b218059.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 5*a(n-1) - 3*a(n-2) - 2*a(n-3).
%F Empirical g.f.: 2*x*(2 - x - 2*x^2) / (1 - 5*x + 3*x^2 + 2*x^3). - _Colin Barker_, Mar 09 2018
%e Some solutions for n=3:
%e ..0..0..1....1..1..0....1..0..0....0..0..1....0..0..0....1..0..1....0..0..1
%e ..1..0..0....0..0..0....1..0..1....1..0..0....1..0..1....0..0..1....1..0..1
%e ..0..0..1....0..0..0....1..1..1....1..0..1....1..1..1....1..0..0....0..0..0
%Y Cf. A218064.
%K nonn
%O 1,1
%A _R. H. Hardin_, Oct 19 2012
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