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

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A098508 Second column of the inverse of a Catalan scaled binomial matrix. 1
0, 0, 1, 3, 3, 5, 5, 7, 14, 18, 45, 55, 33, 39, 91, 7, 4, 68, 51, 57, 19, 7, 77, 253, 23, 25, 325, 351, 27, 29, 435, 465, 248, 88, 187, 85, 45, 333, 703, 741, 39, 41, 41, 43, 473, 11, 23, 1081, 94, 98, 1225, 425, 221, 689, 477, 495, 385, 133, 551, 1711, 295, 305, 1891 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Second column of A098505.

LINKS

Table of n, a(n) for n=0..62.

FORMULA

a(n)=numerator((n+1)binomial(n, 2)/binomial(2n, n)); a(n)=numerator((n-1)n(n+1)/(2binomial(2n, n)).

CROSSREFS

Sequence in context: A245145 A092316 A142456 * A051593 A142712 A046200

Adjacent sequences:  A098505 A098506 A098507 * A098509 A098510 A098511

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Sep 11 2004

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 August 20 16:36 EDT 2014. Contains 245799 sequences.