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A012862 Numerators of coefficients in Taylor series expansion of arccosh(cosec(x)*arctanh(x)). 1
1, 7, 211, 87583, 1551091, 26136390307, 26950515152273, 1654341031718587, 6818178632103851, 5017431660958281659233, 191065819328171102145251947, 118321866231849362450533828517, 14214423223280744764724946368993, 9325196363494467475081247926762363 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

EXAMPLE

x+7/30*x^3+211/1800*x^5+87583/1134000*x^7+1551091/27216000*x^9+...

CROSSREFS

Cf. A202384.

Sequence in context: A241649 A256288 A061028 * A045760 A046033 A193836

Adjacent sequences:  A012859 A012860 A012861 * A012863 A012864 A012865

KEYWORD

nonn,frac

AUTHOR

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

EXTENSIONS

Corrected by N. J. A. Sloane, Dec 21 2011

STATUS

approved

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Last modified July 26 18:16 EDT 2017. Contains 289839 sequences.