|
|
A068557
|
|
From denominators in expansion of tan(arcsinh(x)) - sin(arctanh(x)).
|
|
1
|
|
|
1, 1, 1, 1, 189, 189, 12474, 43659, 4191264, 37721376, 120406632192, 220745492352, 974812094226432, 78959779632340992, 4421747659411095552, 1658155372279160832, 49948354512933617664, 1519878479474057051897856, 15633035788876015390949376
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,5
|
|
REFERENCES
|
R. W. Gosper, personal communication, Mar 07, 2002
|
|
LINKS
|
|
|
EXAMPLE
|
4/189*x^9+4/189*x^11+377/12474*x^13+1202/43659*x^15+...
|
|
MATHEMATICA
|
Take[Denominator[CoefficientList[Series[Tan[ArcSinh[x]]-Sin[ArcTanh[x]], {x, 0, 40}], x]], {2, -1, 2}] (* Harvey P. Dale, Dec 17 2014 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,frac
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|