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A137239 a(n)= number of Catalan numbers with n digits. 1

%I #6 Jun 26 2013 05:42:18

%S 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,

%T 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,

%U 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

%N a(n)= number of Catalan numbers with n digits.

%H J. Mulder, <a href="/A137239/b137239.txt">Table of n, a(n) for n = 1..12034</a>

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

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

%Y Cf. A000108.

%K nonn,base,easy

%O 1,1

%A _Ctibor O. Zizka_, Mar 09 2008

%E Corrected and extended by _Sean A. Irvine_, Feb 07 2010

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Last modified April 23 13:04 EDT 2024. Contains 371913 sequences. (Running on oeis4.)