%I A056616
%S A056616 1,2,6,20,70,252,924,1144,12870,48620,184756,705432,2704156,10400600,
%T A056616 40116600,155117520,200360130,466721244,9075135300,11781754600,
%U A056616 137846528820,538257874440,140273264248,8233430727600,32247603683100
%N A056616 Numerator of binomial(2n,n)/(2n+1).
%C A056616 It is easy to type binomial(2n,n)/(2n+1) by mistake, when one really 
               wants the Catalan numbers binomial(2n,n)/(n+1), A000108.
%C A056616 Differs from A000984 at positions in A101681.
%e A056616 1, 2/3, 6/5, 20/7, 70/9, 252/11, 924/13, 1144/5, 12870/17, ...
%Y A056616 Cf. A056617, A000108.
%Y A056616 Sequence in context: A065345 A130914 A087944 this_sequence A065346 A071976 
               A000984
%Y A056616 Adjacent sequences: A056613 A056614 A056615 this_sequence A056617 A056618 
               A056619
%K A056616 nonn,frac
%O A056616 0,2
%A A056616 N. J. A. Sloane (njas(AT)research.att.com), Aug 28 2000