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

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A009027 Expansion of cos(ln(1+x))/exp(x). 0
1, -1, 0, 5, -27, 129, -654, 3695, -23475, 166727, -1309684, 11244309, -104234215, 1029821545, -10679924202, 113869873039, -1205722312839, 11744215117935, -79159333236840, -612589942020923, 48022885459499181, -1644758184992095631 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

Cos[ Log[ 1+x ] ]/Exp[ x ]

CROSSREFS

Sequence in context: A202508 A129868 A069993 * A037498 A198771 A084177

Adjacent sequences:  A009024 A009025 A009026 * A009028 A009029 A009030

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 15 1997 by Olivier Gérard.

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified September 30 08:09 EDT 2014. Contains 247419 sequences.