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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A014228 Product of 3 successive Catalan numbers. 1
2, 10, 140, 2940, 77616, 2378376, 80978040, 2982691140, 116776877360, 4800591267472, 205384736883872, 9084324900632800, 413286869105712000, 19262120149391220000, 916763612521908006000, 44440565510927197408500, 2189466044883038600910000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..300

FORMULA

a(n) ~ 64^(n+1) / (Pi^(3/2) * n^(9/2)). - Vaclav Kotesovec, Aug 25 2014

MAPLE

a:= proc(n) option remember; `if`(n=0, 2,

      8*(2*n-1)*(2*n+1)*(2*n+3) *a(n-1) /((n+1)*(n+2)*(n+3)))

    end:

seq(a(n), n=0..20);  # Alois P. Heinz, Oct 20 2013

CROSSREFS

Cf. A000108.

Sequence in context: A171214 A213955 A091990 * A059475 A156296 A003046

Adjacent sequences:  A014225 A014226 A014227 * A014229 A014230 A014231

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 21 09:06 EDT 2018. Contains 316406 sequences. (Running on oeis4.)