login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A009438 Expansion of e.g.f. log(1+x)/exp(tan(x)). 1
0, 1, -3, 8, -32, 149, -831, 5340, -38744, 316161, -2846611, 28263960, -305651048, 3593550245, -45584631743, 622159233948, -9091059243792, 141783419182561, -2351573180823939, 41355560621409352, -768924714448510480 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

a(n) ~ (n-1)! * (-1)^(n+1) * exp(tan(1)). - Vaclav Kotesovec, Jan 23 2015

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Log[1+x]/Exp[Tan[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jan 28 2014 *)

CROSSREFS

Sequence in context: A103939 A094610 A064316 * A321520 A321522 A328053

Adjacent sequences:  A009435 A009436 A009437 * A009439 A009440 A009441

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

Prior Mathematica program corrected by Harvey P. Dale, Jan 28 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 18 00:51 EDT 2019. Contains 328135 sequences. (Running on oeis4.)