login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A068409 a(n) = binomial(binomial(2*n,n),n). 1
1, 2, 15, 1140, 916895, 8137369800, 850423134076516, 1105964895591808388136, 18627853605123584223921210120, 4180709311038401636820646431913319660, 12767818425644517198178541333546326811326975100 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Robert Israel, Table of n, a(n) for n = 0..42

MAPLE

f:= n -> binomial(binomial(2*n, n), n):

map(f, [$0..12]); # Robert Israel, Jan 15 2017

PROG

(PARI) a(n)=binomial(binomial(2*n, n), n)

CROSSREFS

Cf. A000984.

Sequence in context: A090604 A007467 A132317 * A096232 A193869 A320768

Adjacent sequences:  A068406 A068407 A068408 * A068410 A068411 A068412

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Mar 05 2002

EXTENSIONS

Edited by N. J. A. Sloane at the suggestion of Vladeta Jovovic, Apr 14 2008

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 22 06:08 EDT 2020. Contains 337289 sequences. (Running on oeis4.)