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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A051785 Number of letters in n-th Catalan number. 0
2, 3, 4, 6, 4, 3, 3, 4, 3, 3, 4, 5, 6, 7, 6, 5, 6, 6, 5, 4, 7, 8, 9, 11, 9, 8, 8, 9, 8, 6, 8, 9, 10, 12, 10, 9, 9, 10, 9, 8, 10, 11, 12, 14, 12, 11, 11, 12, 11, 9, 11, 12, 13, 15, 13, 12, 12, 13, 12, 8, 10, 11, 12, 14, 12, 11, 11, 12, 11, 7, 9, 10, 11, 13, 11, 10, 10, 11, 10, 8, 10, 11 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

J. Gili, Catalan Grammar, Dolphin. Oxford 1993, p. 39.

R. P. Stanley, Enumerative Combinatorics, vol. 2, problem 6.24.

LINKS

Table of n, a(n) for n=1..82.

Amer. Math. Monthly 103 (1996), see pages 538 and 577.

Catalan Institute of America, Home Page

Index entries for sequences related to number of letters in n

EXAMPLE

In Catalan: un, dos, tres, quatre, cinc, sis, set, vuit, nou, deu, onze, dotze, tretze, catorze, quinze, setze, disset, divuit, dinou, vint, ...

CROSSREFS

Cf. A000108, A005589.

Sequence in context: A260272 A128332 A074103 * A144825 A159633 A049044

Adjacent sequences:  A051782 A051783 A051784 * A051786 A051787 A051788

KEYWORD

nonn,easy,word,nice

AUTHOR

N. J. A. Sloane and Richard Borcherds, Dec 09 1999

EXTENSIONS

More terms from F. Xavier Noria (fxn(AT)retemail.es) and Manuel Valdivia Prades (mvaldivia(AT)ugr.es), Dec 10 1999

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 23 22:04 EDT 2018. Contains 316541 sequences. (Running on oeis4.)