%I A071723
%S A071723 1,4,15,54,192,682,2431,8710,31382,113696,414086,1515516,5571750,
%T A071723 20569590,76228095,283481670,1057628550,3957577800,14849601090,
%U A071723 55859886420,210622646520,795898303668,3013646759910,11432740177564
%N A071723 Expansion of (1+x^2*C^2)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. 
               for Catalan numbers, A000108.
%Y A071723 Sequence in context: A090326 A006234 A094821 this_sequence A001559 A002311 
               A102349
%Y A071723 Adjacent sequences: A071720 A071721 A071722 this_sequence A071724 A071725 
               A071726
%K A071723 nonn
%O A071723 0,2
%A A071723 N. J. A. Sloane (njas(AT)research.att.com), Jun 06 2002