%I A156509
%S A156509 2,12,390,12963,1881506,1336889688,9293294524192,249490585063875516
%N A156509 Number of nXn arrays of squares of integers, symmetric about main diagonal, 
               with all rows summing to 45.
%Y A156509 Sequence in context: A012547 A009706 A012551 this_sequence A051009 A060942 
               A072446
%Y A156509 Adjacent sequences: A156506 A156507 A156508 this_sequence A156510 A156511 
               A156512
%K A156509 nonn
%O A156509 2,1
%A A156509 Ron Hardin (rhhardin(AT)att.net) Feb 09 2009