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A141459 A027760(n)/2. 4
1, 3, 1, 15, 1, 21, 1, 15, 1, 33, 1, 1365, 1, 3, 1, 255, 1, 399, 1, 165, 1, 69, 1, 1365, 1, 3, 1, 435, 1, 7161, 1, 255, 1, 3, 1, 959595, 1, 3, 1, 6765, 1, 903, 1, 345, 1, 141, 1, 23205, 1, 33, 1, 795, 1, 399, 1, 435, 1, 177, 1, 28393365, 1, 3, 1, 255, 1, 32361, 1, 15, 1, 2343, 1, 70050435 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Conjecture: a(n) = denominator of integral_{0..1}(log(1-1/x)^n) dx - Jean-François Alcover, Feb 01 2013

LINKS

Table of n, a(n) for n=1..72.

FORMULA

a(2*n+1) = 1. a(2*n)= A001897(n).

MATHEMATICA

a[n_] := If[OddQ[n], 1, Denominator[-2*(2^(n - 1) - 1)*BernoulliB[n]]]; Table[a[n], {n, 1, 72}] (* Jean-François Alcover, Jan 30 2013 *)

CROSSREFS

Sequence in context: A101820 A055301 A214073 * A176727 A080924 A232179

Adjacent sequences:  A141456 A141457 A141458 * A141460 A141461 A141462

KEYWORD

nonn

AUTHOR

Paul Curtz, Aug 08 2008

EXTENSIONS

Offset set to 1, sequence extended - R. J. Mathar, Nov 22 2009

STATUS

approved

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Last modified November 26 06:16 EST 2014. Contains 250020 sequences.