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A156516 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 53. 0
2, 12, 180, 6058, 2130020, 3614728470, 37525899871744, 1411771686417771108 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..9.

CROSSREFS

Sequence in context: A007129 A125861 A228508 * A228593 A067962 A134716

Adjacent sequences:  A156513 A156514 A156515 * A156517 A156518 A156519

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified February 27 10:15 EST 2020. Contains 332304 sequences. (Running on oeis4.)