login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A013120 Expansion of e.g.f. tan(tanh(x) + log(x+1)). 0
0, 2, -1, 16, -54, 612, -4710, 57944, -683144, 10015344, -154359720, 2701047424, -50673755088, 1040194570144, -22870244075952, 540441764640064, -13599312731310720, 363949691199176448, -10307618997050443392 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

EXAMPLE

2*x - 1/2!*x^2 + 16/3!*x^3 - 54/4!*x^4 + 612/5!*x^5 ...

CROSSREFS

Sequence in context: A012967 A013121 A012963 * A012968 A266827 A316226

Adjacent sequences:  A013117 A013118 A013119 * A013121 A013122 A013123

KEYWORD

sign

AUTHOR

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

EXTENSIONS

a(0)=0 inserted and title improved by Sean A. Irvine, Jul 31 2018

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 February 27 18:47 EST 2020. Contains 332308 sequences. (Running on oeis4.)