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A202384
Denominators of coefficients in Taylor series expansion of arccosh(cosec(x)*arctanh(x)).
1
1, 30, 1800, 1134000, 27216000, 583783200000, 735566832000000, 53591297760000000, 256505356800000000, 215539912286899200000000, 9246662237107975680000000000, 6380196943604503219200000000000, 846215594625439374336000000000000, 608171468659065776424960000000000000
OFFSET
0,2
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
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Dec 21 2011
STATUS
approved