A012868 Numerators of coefficients in Taylor series expansion of log(cotan(x)*arcsinh(x)).

0, -1, -1, -1, 347, -1531, 590267, -37723537, 1103996977, -2158074791, 328785573754709, -134852375996381, 3427455470023873621, -13844935285148389217, 6142449451071240707, -43761094586606903148089, 37938502177281712935274975819, -110450564689571423030247983611, 4389621268440117526955711378765711

Offset

0,5

Links

Table of n, a(n) for n=0..18.

Example

-1/2*x^2-1/60*x^4-1/18*x^6+347/22680*x^8-1531/85050*x^10+590267/52123500*x^12+...

Crossrefs

Cf. A202622.

Sequence in context: A343701 A142369 A190814 * A343303 A226669 A226665

Adjacent sequences: A012865 A012866 A012867 * A012869 A012870 A012871

Keyword

sign,frac

Author

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

Extensions

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

Status

approved