A130425 a(n) = numerator of Sum_{k=1..n} 1/k^(n+1-k).

1, 3, 19, 107, 1471, 164059, 65442581, 26560388929, 10901416818161, 4504891039128649, 20562691778919031051, 94108143760454361244249, 5609165278757040127506253363, 334755533004517896353486403105731

Offset

1,2

Links

Table of n, a(n) for n=1..14.

Mathematica

Table[Numerator[Sum[1/k^(n + 1 - k), {k, 1, n}]], {n, 1, 20}] (* Stefan Steinerberger, May 30 2007 *)

Crossrefs

Cf. A130426, A003101.

Sequence in context: A323290 A072950 A240123 * A334976 A103005 A162354

Adjacent sequences: A130422 A130423 A130424 * A130426 A130427 A130428

Keyword

frac,nonn

Author

Leroy Quet, May 26 2007

Extensions

More terms from Stefan Steinerberger, May 30 2007

Status

approved