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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
OFFSET
1,1
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
KEYWORD
nonn,base,easy
AUTHOR
Ctibor O. Zizka, Mar 09 2008
EXTENSIONS
Corrected and extended by Sean A. Irvine, Feb 07 2010
STATUS
approved