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A156509 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 45. 0
2, 12, 390, 12963, 1881506, 1336889688, 9293294524192, 249490585063875516 (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: A012547 A009706 A012551 * A229919 A287679 A051009

Adjacent sequences:  A156506 A156507 A156508 * A156510 A156511 A156512

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified May 7 19:23 EDT 2021. Contains 343652 sequences. (Running on oeis4.)