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A000942
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Number of free planar polyenoids with n nodes.
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2
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1, 1, 1, 3, 4, 12, 26, 77, 204, 624, 1817, 5585, 17007, 52803, 164001, 514009, 1615044, 5100324, 16152134, 51324864
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history;
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OFFSET
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1,4
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LINKS
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Table of n, a(n) for n=1..20.
S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, Enumeration of polyene hydrocarbons: a complete mathematical solution, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751
S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, Enumeration of polyene hydrocarbons: a complete mathematical solution, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751. [Annotated scanned copy]
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CROSSREFS
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Cf. A197459 (where polyedges may have cycles).
Sequence in context: A333163 A111758 A264484 * A255436 A197459 A330659
Adjacent sequences: A000939 A000940 A000941 * A000943 A000944 A000945
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KEYWORD
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nonn,more
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AUTHOR
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E. K. Lloyd (E.K.Lloyd(AT)soton.ac.uk)
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EXTENSIONS
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More terms from Sean A. Irvine, Oct 12 2015
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STATUS
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approved
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