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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A009301 E.g.f. exp(x/cosh(x)). 1
1, 1, 1, -2, -11, -4, 181, 624, -3863, -37808, 66121, 2529440, 4478365, -197245632, -1211701763, 17275207936, 226423491793, -1517532372736, -43068302925551, 78275049887232, 8876725117679941, 24598365340871680, -1997577117130009403, -16151599386896207872, 483811389670392875449 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..24.

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Exp[x/Cosh[x]], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Jan 26 2016 *)

PROG

(PARI)

N=33;  x='x+O('x^N);

egf=exp(x*1/cosh(x));

Vec(serlaplace(egf))

/* Joerg Arndt, Sep 15 2012 */

CROSSREFS

Cf. A009118, A009562.

Sequence in context: A152985 A257112 A077272 * A087552 A124688 A158616

Adjacent sequences:  A009298 A009299 A009300 * A009302 A009303 A009304

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

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 14 12:17 EDT 2019. Contains 328005 sequences. (Running on oeis4.)