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

 

Logo

Many excellent designs for a new banner were submitted. We will use the best of them in rotation.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A115634 Expansion of (1-4x^2)/(1-x^2). 2
1, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Row sums of number triangle A115633.

LINKS

Table of n, a(n) for n=0..59.

FORMULA

a(n)=4*0^n-3*(1+(-1)^n)/2; a(n)=sum{k=0..n, A115633(n, k)}.

CROSSREFS

Sequence in context: A055240 A174559 A183035 * A010674 A021037 A053387

Adjacent sequences:  A115631 A115632 A115633 * A115635 A115636 A115637

KEYWORD

easy,sign

AUTHOR

Paul Barry, Jan 27 2006

STATUS

approved

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

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

Last modified April 18 11:35 EDT 2014. Contains 240707 sequences.