login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A180878 Numerator in fraction A180878/A060818. 1
1, 0, -1, -1, -9, -5, -21, -21, -197, -117, -427, -427, -2501, -1797, -2909, -2909, -72877, -65453 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
COMMENTS
The generating function 1/sqrt((1/x-1)*(1/x+1)) is symmetrical around the origin and has singularities at -1 and +1.
LINKS
FORMULA
Lambert series: Sum_{n >= 1} A180878(n)/A060818(n)*(x^n/(1-x^n)-x^(n+1)/(1-x^(n+1)))=1/sqrt((1/x-1)*(1/x+1)).
CROSSREFS
Cf. Analogous to fraction A180403/A046161.
Sequence in context: A103168 A298584 A238475 * A146282 A117911 A061041
KEYWORD
sign
AUTHOR
Mats Granvik, Sep 23 2010
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 12 20:17 EDT 2024. Contains 371636 sequences. (Running on oeis4.)