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URL: https://oeis.org/A068099

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A068099
a(1) = 1; a(n+1) = n! * Sum_{d|n} a(d)/d where the sum is over the positive divisors d of n.
1
1, 1, 3, 12, 108, 2712, 327240, 235617840, 1187514095040, 47880568312738560, 17374900629326652478080, 63050039403700556512496620800, 2516755812869634374198025332292672000, 1205530061173855456655852851008721562502220800, 7506860765954870344789494144970610151113904559133260800
OFFSET
1,3
LINKS
MATHEMATICA
a[1] = 1; a[n_] := a[n] = (n-1)! * DivisorSum[n-1, a[#]/# &]; Array[a, 15] (* Amiram Eldar, Jun 22 2025 *)
CROSSREFS
Sequence in context: A080447 A127059 A178013 * A224818 A032113 A352637
KEYWORD
nonn
AUTHOR
Leroy Quet, Mar 22 2002
STATUS
approved