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A012857 Numerator 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
0, -1, 3, -50, 203, -7472, 319561, -4725019, 8552625673, -2454640799284, 16155306808034, -5947223237624953, 147005475101499533, -2545370372470913809, 7441717839455761431719 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

The inner function is cosec(x)*arctan(x) = 1- x^2/6 +59*x^4/360 -1723*x^6/15120 +164597*x^8/1814400 -...

LINKS

Table of n, a(n) for n=0..14.

CROSSREFS

Cf. A175671 (denominators).

Sequence in context: A203700 A063893 A145572 * A246221 A249249 A034201

Adjacent sequences:  A012854 A012855 A012856 * A012858 A012859 A012860

KEYWORD

sign,frac

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

EXTENSIONS

Values replaced by numerators. - R. J. Mathar, Dec 20 2011

STATUS

approved

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Last modified August 17 11:40 EDT 2017. Contains 290635 sequences.