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 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 Table of n, a(n) for n=1..18. 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 Adjacent sequences: A180875 A180876 A180877 * A180879 A180880 A180881 KEYWORD sign AUTHOR Mats Granvik, Sep 23 2010 STATUS approved

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