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A261815
Total number of semimagic squares of order n that can be formed from the numbers 1, ..., n^2.
1
1, 0, 72, 549504, 4632344409600
OFFSET
1,3
FORMULA
a(n) = A261816(n)*A048617(n) for n > 1.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
STATUS
approved