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%I #8 Jan 27 2013 02:22:17
%S 9576448,876951552,80485522400,7188107084815,422905697694540,
%T 24906342705832823,1460201980801808620,63739557332176142137,
%U 2783635995639584526500,121426165183353517129064
%N Number of (n+2)X4 0..3 arrays with 3X3 subblock sums nondecreasing rightwards and downwards.
%C Column 2 of A186629
%H R. H. Hardin, <a href="/A186627/b186627.txt">Table of n, a(n) for n = 1..13</a>
%e Some solutions for 6X4
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..1..0..0..3....1..2..1..1....1..1..1..2....0..3..2..2....0..0..2..0
%e ..0..0..0..3....0..0..0..3....0..0..0..1....1..0..0..1....0..0..0..3
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..1..0..3..1....1..1..3..1....1..3..3..1....0..2..3..3....2..0..2..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 24 2011
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