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A156526
Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 81.
+0
1
1, 2, 8, 184, 772, 77184, 641136, 2194362732
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.
AT&T Labs Research
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