%I #3 Mar 31 2012 12:35:35
%S 1,16,6,27,977,6434,146337,20390870,470828929,56179164262
%N Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 15
%K nonn
%O 0,2
%A _R. H. Hardin_ Oct 09 2009