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%I #3 May 10 2013 12:44:51
%S 1,1,1,2,5,5,14,14,41,42,132,132,429,429,1428,1430,4862,4862,16796,
%T 16796,58781,58786,208012,208012,742900,742900,2674426,2674440,
%U 9694845,9694845,35357670,35357670,129644748,129644790,477638700,477638700
%N G.f.: A(x) = (x-2*x^2-2*x^3-(1+x)*sqrt(1-4*x^2)+sqrt(1-4*x^6))/(2*x^2).
%D F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 78, (3.5.30). ( A(x) = s_1 bar (x) ).
%Y Cf. A000108, A000207.
%K nonn
%O 2,4
%A _Vladeta Jovovic_, Aug 24 2001
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