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A339716
Dirichlet g.f.: Product_{k>=2} (1 - k^(-s))^9.
0
1, -9, -9, 27, -9, 72, -9, -12, 27, 72, -9, -171, -9, 72, 72, -90, -9, -171, -9, -171, 72, 72, -9, -63, 27, 72, -12, -171, -9, -495, -9, 135, 72, 72, 72, 189, -9, 72, 72, -63, -9, -495, -9, -171, -171, 72, -9, 747, 27, -171, 72, -171, -9, -63, 72, -63, 72, 72, -9, 801
OFFSET
1,2
FORMULA
a(1) = 1; a(n) = -Sum_{d|n, d < n} A339324(n/d) * a(d).
a(p^k) = A010817(k) for prime p.
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, Dec 14 2020
STATUS
approved