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!)
A178957 Denominators in expansion of 1/(Sum_{n >= 0} (x^n/n!)*binomial(2n,n)/(n+1)). 2
1, 1, 1, 6, 12, 60, 180, 1008, 20160, 25920, 14175, 6652800, 23950080, 141523200, 544864320, 100590336000, 213497856000, 3952082534400, 200074178304000, 3577797070848000, 15595525693440000, 51711479930880000, 28100018194440192000, 1846572624206069760000, 14101100039391805440000, 168600109166641152000000, 2100476360034404352000000, 6405217323775501271040000, 418802671169936621568000000, 2506168365572477878272000000, 2368329105465991594967040000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

This is the reciprocal of the e.g.f. for the Catalan numbers.

LINKS

Table of n, a(n) for n=0..30.

CROSSREFS

Cf. A000108, A178956 (numerators), A178955, A144186/A144187.

Sequence in context: A228847 A093901 A117762 * A104362 A123900 A103972

Adjacent sequences:  A178954 A178955 A178956 * A178958 A178959 A178960

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 31 2010

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 February 25 18:40 EST 2020. Contains 332256 sequences. (Running on oeis4.)