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A120083 Denominators of expansion for Debye function for n=1: D(1,x). 5
1, 4, 36, 1, 3600, 1, 211680, 1, 10886400, 1, 526901760, 1, 16999766784000, 1, 1120863744000, 1, 181400588328960000, 1, 97072790126247936000, 1, 16860010916664115200000, 1, 324325300906011525120000, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Numerators are found under A120082.

LINKS

Table of n, a(n) for n=0..23.

FORMULA

a(n)=denominator(r(n)), with r(n):=[x^n](1-x/4+sum((B(2*k)/((2*k+1)*(2*k)!))*x^(2*k),0,..infinity)), |x|<2*pi. B(2*k):=A000367(k)/A002445(k) (Bernoulli numbers).

a(n) = denominator(B(n)/(n+1)!), n >= 0. See the comment on the e.g.f. D(1,x) in A120082.- Wolfdieter Lang, Jul 15 2013

CROSSREFS

Cf. A120082.

Sequence in context: A183882 A053426 A172282 * A110219 A174413 A162990

Adjacent sequences:  A120080 A120081 A120082 * A120084 A120085 A120086

KEYWORD

nonn,easy,frac

AUTHOR

Wolfdieter Lang, Jul 20 2006

STATUS

approved

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Last modified September 30 18:12 EDT 2020. Contains 337440 sequences. (Running on oeis4.)