A013307 Numerator of [x^n] in the Taylor series arccosh(exp(x) - tan(x)) = x - x^2/6 - x^3/72 - 43*x^4/432 - 221*x^5/10368 - 89513*x^6/2177280 - ...

1, -1, -1, -43, -221, -89513, -149749, -1084711, -209435, -27633784271, -1480512386621, -7957100794591, -26770890495311, -8901132809862257, -397417885842749047, -4636876735719615641

Offset

1,4

Links

Table of n, a(n) for n=1..16.

Crossrefs

Sequence in context: A142659 A140041 A264821 * A043375 A038479 A142334

Adjacent sequences: A013304 A013305 A013306 * A013308 A013309 A013310

Keyword

sign,frac

Author

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

Extensions

Values replaced by numerators. - R. J. Mathar, Dec 22 2011

Status

approved