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A156513 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 50. 0
3, 4, 174, 272, 48562, 360468, 211236822, 5909410784, 14595969900224 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,1
LINKS
CROSSREFS
Sequence in context: A041595 A041741 A041903 * A082213 A097172 A042081
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved

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Last modified July 17 10:03 EDT 2024. Contains 374375 sequences. (Running on oeis4.)