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A000941
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Number of free planar polyenoids with n nodes and symmetry point group C_s.
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2
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0, 0, 0, 0, 2, 5, 21, 58, 194, 570, 1790, 5434, 16924, 52362, 163784, 512670, 1614406, 5096314, 16150180
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refs;
listen;
history;
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OFFSET
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1,5
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LINKS
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Table of n, a(n) for n=1..19.
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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Sequence in context: A328689 A039777 A246167 * A000131 A328041 A242785
Adjacent sequences: A000938 A000939 A000940 * A000942 A000943 A000944
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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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Added a(16)-a(19) and title improved by Sean A. Irvine, Oct 13 2015
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STATUS
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approved
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