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A156412 Number of 13X13 arrays of squares of integers, symmetric about main diagonal, with all rows summing to n. 0
1, 568504, 23041655136, 64008728200384, 20331541618406216, 1051966701961097184, 13952451706754445456 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A124514 A100416 A151878 * A068724 A121169 A090061

Adjacent sequences:  A156409 A156410 A156411 * A156413 A156414 A156415

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 02:31 EST 2012. Contains 205978 sequences.