A130491 a(n) = numerator of Sum_{k=1..n} k^mu(n+1-k), where mu(m) = A008683(m).

1, 3, 9, 35, 91, 179, 117, 1181, 14113, 1415, 14839, 35617, 85271, 53251, 3503033, 1879, 12165719, 106753, 2870239, 6436711, 46663061, 402271, 850810423, 60658043, 1473361913, 10236631, 21081760033, 39731443, 2762347887557

Offset

1,2

Comments

Denominator of Sum_{k=1..n} k^mu(n+1-k) is A130492(n).

Links

Table of n, a(n) for n=1..29.

Maple

A130491 := proc(n) numer(add(k^numtheory[mobius](n+1-k), k=1..n)) ; end: seq(A130491(n), n=1..40) ; # R. J. Mathar, Oct 16 2007

Crossrefs

Cf. A130492, A080306, A080326.

Sequence in context: A292292 A067787 A332370 * A149013 A149014 A149015

Adjacent sequences: A130488 A130489 A130490 * A130492 A130493 A130494

Keyword

frac,nonn

Author

Leroy Quet, May 29 2007

Extensions

More terms from R. J. Mathar, Oct 16 2007

Status

approved