Search: id:A156520
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%I A156520
%S A156520 1,2,2,7,19,50198,788009,1184902962,55064648562
%N A156520 Number of nXn arrays of squares of integers, symmetric about both diagonal 
               and antidiagonal, with all rows summing to 64.
%Y A156520 Sequence in context: A051769 A049955 A156464 this_sequence A069101 A138802 
               A047003
%Y A156520 Adjacent sequences: A156517 A156518 A156519 this_sequence A156521 A156522 
               A156523
%K A156520 nonn
%O A156520 1,2
%A A156520 Ron Hardin (rhhardin(AT)att.net) Feb 09 2009

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