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A175671 Denominator of [x^(2n)] of the Taylor expansion log(cosec(x)*arctan(x))= -x^2/6 +3*x^4/20 -50*x^6/567 +203*x^8/3240 -7472*x^10/155925 +... 1
1, 6, 20, 567, 3240, 155925, 8292375, 147349125, 312615903600, 103180488035625, 769328200265625, 316985199315159375, 8682638068197843750, 165206922515800790625, 527010082825404522093750, 39040543480476432234965625, 33712429605969723121012500000, 1968441947987203748028891796875 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Cf. A012857 (numerators).

Sequence in context: A267903 A280039 A216912 * A222741 A069257 A133885

Adjacent sequences:  A175668 A175669 A175670 * A175672 A175673 A175674

KEYWORD

nonn,frac

AUTHOR

R. J. Mathar, Dec 20 2011

STATUS

approved

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Last modified November 21 12:51 EST 2017. Contains 295001 sequences.