login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A091691 a(n) = (10^(n-1)-1) * (n-10) / 9. 0
1, 0, -8, -77, -666, -5555, -44444, -333333, -2222222, -11111111, 0, 1111111111, 22222222222, 333333333333, 4444444444444, 55555555555555, 666666666666666, 7777777777777777, 88888888888888888, 999999999999999999, 11111111111111111110, 122222222222222222221 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
G.f.: ( 1+133*x^2-121*x^3-22*x ) / ( (10*x-1)^2*(x-1)^2 ). - R. J. Mathar, Feb 14 2015
MATHEMATICA
LinearRecurrence[{22, -141, 220, -100}, {1, 0, -8, -77}, 30] (* Harvey P. Dale, Jun 24 2018 *)
CROSSREFS
Cf. A091686.
Sequence in context: A105429 A225348 A091686 * A024103 A187638 A092661
KEYWORD
easy,sign
AUTHOR
Paul Barry, Jan 29 2004
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 12 19:59 EDT 2024. Contains 374252 sequences. (Running on oeis4.)