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A156471 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 19. 0
2, 28, 76, 6024, 39000, 4562152, 61580624, 13526490400, 338077231956, 183471645987760 (list; graph; refs; listen; history; text; internal format)
OFFSET
3,1
LINKS
CROSSREFS
Sequence in context: A336464 A245801 A296245 * A329595 A138964 A200040
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved

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Last modified March 28 10:31 EDT 2024. Contains 371240 sequences. (Running on oeis4.)