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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A013566 E.g.f. sec(log(x+1)/exp(x)). 1
1, 0, 1, -9, 64, -510, 5140, -62650, 868516, -13417104, 229831820, -4334605748, 89205406112, -1988081805528, 47701228486496, -1226141059648440, 33617215231898512, -979251053876769920, 30201854389236416848 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..400

EXAMPLE

sec(log(x+1)/exp(x)) = 1 + 1/2!*x^2 - 9/3!*x^3 + 64/4!*x^4 - 510/5!*x^5 + ..

MATHEMATICA

CoefficientList[Series[Sec[Log[x + 1]/Exp[x]], {x, 0, 40}], x] Range[0, 40]! (* G. C. Greubel, Nov 15 2016 *)

PROG

(PARI) for(n=0, 15, print1(n!*polcoeff(1/cosh(ln(1+x)*exp(-x)), n), ", ")) \\ G. C. Greubel, Nov 16 2016

CROSSREFS

Sequence in context: A049684 A037540 A037484 * A056769 A273232 A064546

Adjacent sequences:  A013563 A013564 A013565 * A013567 A013568 A013569

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 21 22:56 EST 2018. Contains 299427 sequences. (Running on oeis4.)