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A156526 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 81. 0
1, 2, 8, 184, 772, 77184, 641136, 2194362732 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A317794 A009377 A181234 * A009505 A305737 A028368
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved

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Last modified March 19 06:56 EDT 2024. Contains 370953 sequences. (Running on oeis4.)