A202576 - OEIS

%I #5 Mar 31 2012 12:36:49

%S 10,90,616,3731,20208,102665,492118,2275947,10175908,44549594,

%T 190996160,808576340,3377247432,13999854480,57518174798,235275969669,

%U 956569084218,3879844758272,15670308778784,63219573247523,254277270362900

%N Number of nX2 0..3 arrays with the row and column sums nondecreasing

%C Column 2 of A202581

%H R. H. Hardin, <a href="/A202576/b202576.txt">Table of n, a(n) for n = 1..51</a>

%e Some solutions for n=5

%e ..0..1....1..2....0..3....0..1....0..3....1..3....1..1....1..1....1..0....0..1

%e ..1..1....0..3....3..0....2..0....1..2....1..3....2..1....1..2....1..3....0..2

%e ..1..1....3..1....0..3....0..3....3..2....2..2....1..2....1..2....2..2....0..2

%e ..1..1....3..1....1..3....1..2....3..2....1..3....2..1....1..3....2..2....1..3

%e ..2..3....1..3....3..3....3..2....2..3....3..1....1..2....1..3....3..2....2..3

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 21 2011