%I A156448
%S A156448 1,2,8,68,868,19436,638012,57507580,22620401127,17074878770018,
%T A156448 18408433074826454
%N A156448 Number of nXn arrays of squares of integers, symmetric about main diagonal, 
               with all rows summing to 9.
%Y A156448 Sequence in context: A053922 A030445 A093990 this_sequence A157752 A055547 
               A113087
%Y A156448 Adjacent sequences: A156445 A156446 A156447 this_sequence A156449 A156450 
               A156451
%K A156448 nonn
%O A156448 1,2
%A A156448 Ron Hardin (rhhardin(AT)att.net) Feb 09 2009