%I #5 Mar 31 2012 12:36:46
%S 4,77,1170,14107,139471,1177568,8721417,57801225,347923603,1924356711,
%T 9871703167,47329086175,213435856527,910247506472,3688234465315,
%U 14255722610693,52746861442115,187406263165391,641125854338628
%N Number of nX2 zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing
%C Column 2 of A201989
%H R. H. Hardin, <a href="/A201984/b201984.txt">Table of n, a(n) for n = 1..177</a>
%e Some solutions for n=5
%e .-3..2...-3.-2...-3..2...-3..2...-3..3...-3.-2...-3.-1...-3.-3...-2.-2...-3..1
%e .-2.-2...-3.-1...-2.-1...-3..2...-1.-2...-3..2...-2..1...-3..3...-2..3...-2..1
%e ..0.-1....0..1...-1..2...-2..2...-1..0...-2..1....0.-3...-1..1....0.-2...-2..3
%e ..0..3....1..2....0..3....3.-3...-1..3....1..3....2..3...-1..2....2..1...-1..0
%e ..0..3....3..2....2.-2....3.-1....2..0....2..1....3..0....2..3....3.-1....2..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 07 2011
|