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A156412 Number of 13 X 13 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; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..6.

CROSSREFS

Sequence in context: A273236 A237935 A237693 * A068724 A233651 A288085

Adjacent sequences: A156409 A156410 A156411 * A156413 A156414 A156415

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 09 2009

STATUS

approved

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Last modified March 28 01:22 EDT 2023. Contains 361575 sequences. (Running on oeis4.)