%I
%S 40,100,208,520,1120,2800,6208,15520,35200,88000,203008,507520,
%T 1185280,2963200,6980608,17451520,41359360,103398400,246059008,
%U 615147520,1467965440,3669913600,8774238208,21935595520,52511211520,131278028800
%N Number of (n+1) X (1+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constantstress 1 X 1 tilings).
%H R. H. Hardin, <a href="/A235271/b235271.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 10*a(n2)  24*a(n4).
%F Conjectures from _Colin Barker_, Oct 17 2018: (Start)
%F G.f.: 4*x*(2 + 5*x)*(5  24*x^2) / ((1  2*x)*(1 + 2*x)*(1  6*x^2)).
%F a(n) = (2)^n + 9*2^n + 6^((1/2)*(1+n))*(1212*(1)^n + 5*sqrt(6) + 5*(1)^n*sqrt(6)).
%F (End)
%e Some solutions for n=4:
%e 3 2 2 4 2 0 4 2 4 3 1 3 0 4 2 4 1 4 4 1
%e 0 4 3 0 1 4 0 3 0 4 3 0 3 2 3 0 4 2 1 3
%e 3 2 0 2 4 2 3 1 1 0 2 4 0 4 2 4 0 3 3 0
%e 0 4 3 0 1 4 0 3 0 4 4 1 1 0 3 0 2 0 0 2
%e 4 3 0 2 2 0 2 0 2 1 1 3 0 4 0 2 1 4 3 0
%Y Column 1 of A235280.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 05 2014
