%I A010058
%S A010058 0,1,1,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,
%T A010058 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,
%U A010058 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N A010058 1 if n is a Catalan number else 0.
%H A010058 <a href="Sindx_Ch.html#char_fns">Index entries for characteristic functions</
               a>
%Y A010058 Cf. A000108.
%Y A010058 Sequence in context: A057212 A023959 A076182 this_sequence A140591 A079336 
               A057215
%Y A010058 Adjacent sequences: A010055 A010056 A010057 this_sequence A010059 A010060 
               A010061
%K A010058 nonn
%O A010058 0,1
%A A010058 N. J. A. Sloane (njas(AT)research.att.com).