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%I #2 Mar 30 2012 17:25:51
%S 1,1,3,5,13,26,66,152,366,907,2225,6864
%N Number of constitutional isomers of alkylcyclobutadienes.
%D Ching-Wan Lam, "Enumeration of isomers of alkylcyclobutadienes by means of alkyl 1,1,1-triradicals", J. Math. Chem., vol. 31 (2002), pp. 333 - 337. See Table 1 on page 336.
%e If n=15 then the number of constitutional isomers of alkylcyclobutadienes is 6864.
%K nonn
%O 4,3
%A _Parthasarathy Nambi_, Aug 28 2008
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