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!)
A137239 a(n)= number of Catalan numbers with n digits. 1
4, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

J. Mulder, Table of n, a(n) for n = 1..12034

EXAMPLE

1-digit Catalan numbers are 1,1,2,5 so a(1)=4

2-digits Catalan numbers are 14,24 so a(2)=2

CROSSREFS

Cf. A000108.

Sequence in context: A282698 A136709 A254969 * A136714 A280135 A297825

Adjacent sequences:  A137236 A137237 A137238 * A137240 A137241 A137242

KEYWORD

nonn,base,easy

AUTHOR

Ctibor O. Zizka, Mar 09 2008

EXTENSIONS

Corrected and extended by Sean A. Irvine, Feb 07 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 June 3 23:57 EDT 2020. Contains 334808 sequences. (Running on oeis4.)