%I A156526
%S A156526 1,2,8,184,772,77184,641136,2194362732
%N A156526 Number of nXn arrays of squares of integers, symmetric about both diagonal 
               and antidiagonal, with all rows summing to 81.
%Y A156526 Sequence in context: A105232 A009713 A009377 this_sequence A009505 A028368 
               A056990
%Y A156526 Adjacent sequences: A156523 A156524 A156525 this_sequence A156527 A156528 
               A156529
%K A156526 nonn
%O A156526 1,2
%A A156526 Ron Hardin (rhhardin(AT)att.net) Feb 09 2009