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A156514 Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 51. +0
1
5, 116, 452, 60568, 662388, 382580208, 13757627936, 22555562198752 (list; graph; listen)
OFFSET

3,1

CROSSREFS

Sequence in context: A089638 A109057 A080988 this_sequence A006221 A144998 A067359

Adjacent sequences: A156511 A156512 A156513 this_sequence A156515 A156516 A156517

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Feb 09 2009

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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