Search: id:A137239
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%I A137239
%S A137239 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,
%T A137239 1,2,2,1,2,2,1,2,2,1,2,2,1,2,2,1,2,2,2,1,2,1,1,1,2,1,2,2,1,2,2,1,2,2,1,
%U A137239 2,2,1,2,2,1,2,2,1
%N A137239 a(n)= number of Catalan numbers with n digits.
%e A137239 1-digit Catalan numbers are 1,1,2,5 so a(1)=4
%e A137239 2-digits Catalan numbers are 14,24 so a(2)=2
%Y A137239 Cf. A000108.
%Y A137239 Sequence in context: A102888 A071558 A136709 this_sequence A136714 A010314 
               A080133
%Y A137239 Adjacent sequences: A137236 A137237 A137238 this_sequence A137240 A137241 
               A137242
%K A137239 nonn,base,easy,more
%O A137239 1,1
%A A137239 Ctibor O. ZIZKA (ctibor.zizka(AT)seznam.cz), Mar 09 2008

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