

A051785


Number of letters in nth 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
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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



