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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A188317 Riordan array, inverse of (1/(1-x^2), x/((1-x)*(1-x^2))). 1
1, 0, 1, -1, -1, 1, 2, -1, -2, 1, -1, 6, 0, -3, 1, -6, -10, 10, 2, -4, 1, 20, -4, -26, 13, 5, -5, 1, -22, 63, 14, -49, 14, 9, -6, 1, -49, -148, 112, 58, -78, 12, 14, -7, 1, 260, 45, -396, 144, 138, -111, 6, 20, -8, 1, -441, 755, 435, -789, 123, 263, -145, -5, 27, -9, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,7

COMMENTS

Inverse of number triangle A188316.

LINKS

Table of n, a(n) for n=0..65.

EXAMPLE

Triangle begins

1,

0, 1,

-1, -1, 1,

2, -1, -2, 1,

-1, 6, 0, -3, 1,

-6, -10, 10, 2, -4, 1,

20, -4, -26, 13, 5, -5, 1,

-22, 63, 14, -49, 14, 9, -6, 1,

-49, -148, 112, 58, -78, 12, 14, -7, 1,

260, 45, -396, 144, 138, -111, 6, 20, -8, 1

Production matrix begins

0, 1,

-1, -1, 1,

1, -1, -1, 1,

0, 1, -1, -1, 1,

0, 0, 1, -1, -1, 1,

0, 0, 0, 1, -1, -1, 1,

0, 0, 0, 0, 1, -1, -1, 1,

0, 0, 0, 0, 0, 1, -1, -1, 1,

0, 0, 0, 0, 0, 0, 1, -1, -1, 1

CROSSREFS

Sequence in context: A003417 A158986 A079900 * A117354 A140324 A010250

Adjacent sequences:  A188314 A188315 A188316 * A188318 A188319 A188320

KEYWORD

sign,tabl

AUTHOR

Paul Barry, Mar 28 2011

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 December 22 19:34 EST 2014. Contains 252365 sequences.