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A012869 Numerator of [x^(2n+1)] in the Taylor series arccos(cot(x)*arcsinh(x))= x-x^3/15 +4*x^5/75 -2098*x^7/70875 +2969*x^9/141750 -35380322*x^11/2280403125 +... 0
1, -1, 4, -2098, 2969, -35380322, 8716535447, -1798049740063, 19914123417989, -181876796289510461, 186781215146313235681, -24121633940851905518327, 40268463790986459750095639, -4555735317599779344180767417 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

The inner function is cot(x)*arcsinh(x) = 1-x^2/2 +13*x^4/120 -49*x^6/7210 +79357*x^8/1814400 -344579*x^10/10886400 +..

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A198907 A207863 A220941 * A172941 A180993 A192889

Adjacent sequences:  A012866 A012867 A012868 * A012870 A012871 A012872

KEYWORD

sign,frac

AUTHOR

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

EXTENSIONS

Values replaced by numerators. - R. J. Mathar, Dec 22 2011

STATUS

approved

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Last modified November 24 00:27 EST 2017. Contains 295164 sequences.