login
This site is supported by donations to The OEIS Foundation.

 

Logo

The submissions stack has been unacceptably high for several months now. Please voluntarily restrict your submissions and please help with the editing. (We don't want to have to impose further limits.)

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A176327 Numerators of the rational sequence with e.g.f. (x/2)*(1+exp(-x))/(1-exp(-x)). 12
1, 0, 1, 0, -1, 0, 1, 0, -1, 0, 5, 0, -691, 0, 7, 0, -3617, 0, 43867, 0, -174611, 0, 854513, 0, -236364091, 0, 8553103, 0, -23749461029, 0, 8615841276005, 0, -7709321041217, 0, 2577687858367, 0, -26315271553053477373, 0, 2929993913841559, 0, -261082718496449122051 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,11

COMMENTS

Numerator of the Bernoulli number B_n, except B(1)=0.

A027641 is the main entry for this sequence, which is only a minor variation. - N. J. A. Sloane, Nov 29 2010.

This could formally be defined by building the arithmetic mean of the numerators in A164555(n) and A027641(n).

LINKS

Table of n, a(n) for n=0..40.

FORMULA

a(2n+1)  = 0. a(2n ) = A000367(n).

a(n) = A164555(n) = A027641(n) if n <>1.

MAPLE

seq(numer((bernoulli(i, 0)+bernoulli(i, 1))/2), i=0..40); # Peter Luschny, Jun 17 2012

CROSSREFS

Cf. A176289 (denominators), A027642, A141056, A164020, A165823

Sequence in context: A036946 A027641 A164555 * A226156 A215616 A249737

Adjacent sequences:  A176324 A176325 A176326 * A176328 A176329 A176330

KEYWORD

sign

AUTHOR

Paul Curtz, Apr 15 2010

EXTENSIONS

New name from Peter Luschny, Jun 18 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified August 29 08:06 EDT 2015. Contains 261188 sequences.