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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A097168 Expansion of (1-7x)/((1-x)(1-9x)(1-10x). 2
1, 13, 151, 1693, 18571, 200473, 2137591, 22571653, 236478211, 2461637233, 25488068431, 262725949213, 2697866876251, 27614135219593, 281860550309671, 2870078286120373, 29164037908416691, 295809674509083553 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Partial sums of A097167. a(n)=A097169(2n+1)/4.

FORMULA

a(n)=10*10^n/3-9*9^n/4-1/12; a(n)=20a(n-1)-109a(n-2)+90a(n-3).

CROSSREFS

Sequence in context: A185405 A051475 A173448 * A108366 A163415 A077416

Adjacent sequences:  A097165 A097166 A097167 * A097169 A097170 A097171

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jul 30 2004

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

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

Last modified February 17 09:30 EST 2012. Contains 206009 sequences.