A202384 Denominators of coefficients in Taylor series expansion of arccosh(cosec(x)*arctanh(x)).

1, 30, 1800, 1134000, 27216000, 583783200000, 735566832000000, 53591297760000000, 256505356800000000, 215539912286899200000000, 9246662237107975680000000000, 6380196943604503219200000000000, 846215594625439374336000000000000, 608171468659065776424960000000000000

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. A012862.

Sequence in context: A007804 A295588 A108298 * A202369 A042743 A042740

Adjacent sequences: A202381 A202382 A202383 * A202385 A202386 A202387

Keyword

nonn,frac

Author

N. J. A. Sloane, Dec 21 2011

Status

approved