A224125 - OEIS

%I #4 Mar 31 2013 05:25:37

%S 20,1080,47059,1703178,53355889,1491827492,38051383139,899713542225,

%T 19963535397227,419672473818646,8421847090410941,162325525523034609,

%U 3020162740527368685,54468878788851494328,955569173872191005683

%N Number of 3Xn 0..3 arrays with row sums nondecreasing and column sums unimodal

%C Row 3 of A224123

%H R. H. Hardin, <a href="/A224125/b224125.txt">Table of n, a(n) for n = 1..21</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 31 2013