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Number of free nonplanar polyenoids with n nodes and symmetry point group C_s.
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%I #18 Oct 16 2015 03:27:39

%S 0,3,20,99,450,1896,7771,30895,121144,468409,1796584,6841014,25925062

%N Number of free nonplanar polyenoids with n nodes and symmetry point group C_s.

%H S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, <a href="http://dx.doi.org/10.1021/ci00026a012">Enumeration of polyene hydrocarbons: a complete mathematical solution</a>, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751.

%H S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, <a href="/A002057/a002057.pdf">Enumeration of polyene hydrocarbons: a complete mathematical solution</a>, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751. [Annotated scanned copy]

%F a(n) = A000131(n+2) - A000941(n). - _Sean A. Irvine_, Oct 15 2015

%K nonn,more

%O 7,2

%A E. K. Lloyd (E.K.Lloyd(AT)soton.ac.uk)

%E a(16)-a(19) and title improved by _Sean A. Irvine_, Oct 16 2015