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A156458 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 13. 0
2, 6, 68, 876, 43300, 3026820, 558858552, 474109634808, 1011861877473980, 3520221010293816000 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..11.

CROSSREFS

Sequence in context: A087331 A097419 A219037 * A244494 A136268 A030242

Adjacent sequences: A156455 A156456 A156457 * A156459 A156460 A156461

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified February 3 04:55 EST 2023. Contains 360024 sequences. (Running on oeis4.)