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A159034
Inverse Euler transform of A155200.
2
2, 7, 170, 16380, 6710886, 11453246035, 80421421917330, 2305843009213685760, 268650182136584261045760, 126765060022822940149666965093, 241677817415439249618874010960062650, 1858395433210885261794643189387357732203180, 57560679870263253393868202642364377389525958615670
OFFSET
1,1
LINKS
FORMULA
a(n) = (1/n)*Sum_{d|n} 2^(d^2)*moebius(n/d).
a(n) ~ 2^(n^2) / n. - Vaclav Kotesovec, Oct 09 2019
MATHEMATICA
Table[Sum[2^(d^2)*MoebiusMu[n/d], {d, Divisors[n]}]/n, {n, 1, 12}] (* Vaclav Kotesovec, Oct 09 2019 *)
PROG
(PARI) a(n)={sumdiv(n, d, 2^(d^2)*moebius(n/d))/n} \\ Andrew Howroyd, Jan 08 2020
CROSSREFS
Cf. A155200.
Sequence in context: A177798 A077746 A236810 * A336249 A120381 A260507
KEYWORD
easy,nonn
AUTHOR
EXTENSIONS
Terms a(12) and beyond from Andrew Howroyd, Jan 08 2020
STATUS
approved