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%I #17 Jul 12 2020 08:23:25
%S 1,1,1,3,4,12,26,77,204,624,1817,5585,17007,52803,164001,514009,
%T 1615044,5100324,16152134,51324864
%N Number of free planar polyenoids with n nodes.
%H S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, <a href="https://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]
%Y Cf. A197459 (where polyedges may have cycles).
%K nonn,more
%O 1,4
%A E. K. Lloyd (E.K.Lloyd(AT)soton.ac.uk)
%E More terms from _Sean A. Irvine_, Oct 12 2015
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