A068339 n!^3 *sum{k=1 to n} mu(k)/k^3, where mu(k) is the Moebius function A008683.

1, 7, 181, 11584, 1434176, 311510016, 106474687488, 54515039993856, 39741464155521024, 39789248881360896000, 52911705535251480576000, 91431427164914558435328000, 200764942140996806158319616000

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Crossrefs

Sequence in context: A141983 A080484 A212944 * A219404 A202026 A302904

Adjacent sequences: A068336 A068337 A068338 * A068340 A068341 A068342

Keyword

nonn

Author

Leroy Quet, Feb 27 2002

Status

approved