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%I #6 Jun 20 2022 19:39:57
%S 20416,184816,1659728,15022720,135896344,1236987584,11259287952,
%T 103178794676,945421176696,8728777849856,80564597517120,
%U 749961596817872,6976731437481296,65526946754262876,614749169773668664
%N Number of (n+1) X (3+1) 0..6 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 3 (constant-stress 1 X 1 tilings).
%H R. H. Hardin, <a href="/A234552/b234552.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=2:
%e 0 3 0 3 3 4 4 6 4 2 2 5 1 2 1 1 2 0 1 3
%e 6 6 6 6 6 4 1 0 4 5 2 2 3 1 3 6 3 4 2 1
%e 2 5 2 5 3 4 4 0 4 2 2 5 4 5 4 4 1 5 6 2
%Y Column 3 of A234555.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 28 2013
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