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The number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons.
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%I #5 Feb 27 2015 21:21:36

%S 2,6,20,70,252,894,3432,12870,48620,149226

%N The number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons.

%C Here n is the number of aromatic sextets.

%D I. Gutman, N. Turkovic and B. Furtula, "On distribution of pi electrons in rhombus-shaped benzenoid hydrocarbons", Indian Journal of Chemistry, Vol. 45A (2006), pp. 1601-1604. See Table 1 on page 1602.

%e If n=1 then the number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons is 2.

%e If n=2 then the number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons is 6.

%e If n=3 then the number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons is 20.

%K nonn

%O 1,1

%A _Parthasarathy Nambi_, Aug 23 2007