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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
5, 116, 452, 60568, 662388, 382580208, 13757627936, 22555562198752 (list; graph; refs; listen; history; internal format)
OFFSET

3,1

CROSSREFS

Sequence in context: A089638 A109057 A080988 * A006221 A144998 A067359

Adjacent sequences:  A156511 A156512 A156513 * A156515 A156516 A156517

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Feb 09 2009

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Last modified February 15 14:57 EST 2012. Contains 205823 sequences.