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A160110 Numerators of |Bernoulli(n)*Gould(n)| for even n, (Gould A001316). 1
1, 1, 1, 2, 1, 10, 1382, 28, 3617, 87734, 349222, 3418052, 472728182, 34212412, 94997844116, 68926730208040, 7709321041217, 5155375716734, 52630543106106954746, 11719975655366236, 522165436992898244102 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

A001897 give the denominators of |Bernoulli(n)*Gould(n)| for even n, also the denominators of the cosecant numbers.

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..314

MAPLE

b := n -> bernoulli(n)*2^add(i, i=convert(n, base, 2));

a := n -> numer(abs(b(2*n)));

MATHEMATICA

G[n_] := Sum[Mod[Binomial[n, k], 2], {k, 0, n}]; (* A001316 *) Table[Abs[BernoulliB[n]*G[n]], {n, 0, 20}][[1 ;; -1 ;; 2]]//Numerator (* G. C. Greubel, Sep 25 2018 *)

CROSSREFS

Cf. A001897.

Sequence in context: A239070 A271042 A098290 * A258055 A139393 A037916

Adjacent sequences:  A160107 A160108 A160109 * A160111 A160112 A160113

KEYWORD

frac,nonn

AUTHOR

Peter Luschny, May 02 2009

STATUS

approved

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Last modified December 7 03:00 EST 2019. Contains 329836 sequences. (Running on oeis4.)