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%I #12 Sep 26 2018 03:03:21
%S 1,1,5,11,33,87,259,730,2150,6278,18622,55340,165857,498907,1509012,
%T 4581570,13967031,42722777,131110259,403527667,1245358416,3852965298,
%U 11948207174,37131355170,115623660978,360712069084,1127276560366
%N Stereoisomeric homologs with molecular formula C_{3+n} H_{6+2n}.
%D G. Polya and R. C. Read, Combinatorial Enumeration of Groups, Graphs and Chemical Compounds, Springer-Verlag, 1987, pp. 63-64.
%H G. Polya, <a href="https://projecteuclid.org/euclid.acta/1485888172">Kombinatorische Anzahlbestimmungen für Gruppen, Graphen und chemische Verbindungen</a>, Acta Math. 68 (1937), 145-254.
%F G.f.: A(x) = (B(x)^6 + 3*B(x^2)^3 + 2*B(x^3)^2)/6, where B(x) is g.f. for A000625.
%Y Cf. A000625, A063832.
%K nonn
%O 0,3
%A _Vladeta Jovovic_, Aug 21 2001
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