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A003708 Expansion of tan(log(1+x)).
(Formerly M3547)
6
0, 1, -1, 4, -18, 110, -810, 7040, -70280, 792200, -9945000, 137550400, -2077719600, 34026132400, -600433397200, 11356783360000, -229193571984000, 4915556301968000, -111644265232656000, 2676908220027392000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
FORMULA
a(n) ~ n! / (exp(Pi/2) * (exp(-Pi/2)-1)^(n+1)). - Vaclav Kotesovec, Feb 16 2015
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Tan[Log[1+x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 28 2013 *)
CROSSREFS
Sequence in context: A214840 A060223 A144085 * A327679 A330353 A000986
KEYWORD
sign
AUTHOR
STATUS
approved

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Last modified April 23 09:22 EDT 2024. Contains 371905 sequences. (Running on oeis4.)