|
| |
|
|
A009723
|
|
Expansion of tan(tanh(x)/cos(x)).
|
|
0
|
|
|
|
1, 3, 57, 1995, 128881, 12775059, 1796958633, 342118793307, 84276974508769, 26141579246291235, 9956883572644073241, 4570240365824839488747, 2487549038143714062879313, 1584207614996350912703688627
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,2
|
|
|
LINKS
|
Table of n, a(n) for n=0..13.
|
|
|
MATHEMATICA
|
With[{nn=30}, Take[CoefficientList[Series[Tan[Tanh[x]/Cos[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 15 2014 *)
|
|
|
CROSSREFS
|
Sequence in context: A053725 A053774 A254570 * A069992 A012196 A012090
Adjacent sequences: A009720 A009721 A009722 * A009724 A009725 A009726
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
R. H. Hardin
|
|
|
EXTENSIONS
|
Extended and signs tested Mar 15 1997 by Olivier Gérard.
Prior Mathematica program replaced by Harvey P. Dale, Dec 15 2014
|
|
|
STATUS
|
approved
|
| |
|
|
