A012862 Numerators of coefficients in Taylor series expansion of arccosh(cosec(x)*arctanh(x)).

1, 7, 211, 87583, 1551091, 26136390307, 26950515152273, 1654341031718587, 6818178632103851, 5017431660958281659233, 191065819328171102145251947, 118321866231849362450533828517, 14214423223280744764724946368993, 9325196363494467475081247926762363

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: A256288 A302107 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