%I #5 Mar 31 2012 12:37:04
%S 2338,27611,275853,3684581,56088455,888172440,14267356381,
%T 230651852383,3739445935138,60705486742742,986065323772866,
%U 16021434746669572,260345712140671916,4230813125922375591,68755635262011437219
%N Number of (n+1)X3 0..3 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards
%C Column 2 of A205027
%H R. H. Hardin, <a href="/A205021/b205021.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 24*a(n-1) -102*a(n-2) -656*a(n-3) +4911*a(n-4) -9576*a(n-5) +5400*a(n-6) for n>21
%e Some solutions for n=4
%e ..2..0..2....1..0..0....0..3..0....0..0..1....0..1..0....0..0..2....0..3..3
%e ..3..0..1....3..0..0....2..0..0....0..0..1....0..0..0....1..0..0....1..3..2
%e ..0..0..3....1..0..3....1..0..1....1..0..0....1..0..2....1..0..2....2..3..1
%e ..2..0..1....1..0..2....1..0..0....3..0..1....3..0..1....2..0..0....2..2..0
%e ..0..0..2....1..0..1....2..0..3....1..0..3....2..0..2....1..0..0....1..3..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 21 2012
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