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A156455 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 12. 0
1, 20, 352, 17550, 2246390, 991288522, 781505368112, 976681206480324, 1865446774685049420 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..11.

CROSSREFS

Sequence in context: A230236 A093144 A285393 * A358365 A089350 A323961

Adjacent sequences: A156452 A156453 A156454 * A156456 A156457 A156458

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified March 20 18:09 EDT 2023. Contains 361391 sequences. (Running on oeis4.)