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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
CROSSREFS
Sequence in context: A012547 A009706 A012551 * A229919 A287679 A051009
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved

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Last modified July 21 09:38 EDT 2024. Contains 374472 sequences. (Running on oeis4.)