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A000948
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Number of free nonplanar polyenoids with n nodes and symmetry point group C_s.
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1
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0, 3, 20, 99, 450, 1896, 7771, 30895, 121144, 468409, 1796584, 6841014, 25925062
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OFFSET
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7,2
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LINKS
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Table of n, a(n) for n=7..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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FORMULA
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a(n) = A000131(n+2) - A000941(n). - Sean A. Irvine, Oct 15 2015
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CROSSREFS
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Sequence in context: A278319 A305203 A246150 * A165960 A074831 A203357
Adjacent sequences: A000945 A000946 A000947 * A000949 A000950 A000951
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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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a(16)-a(19) and title improved by Sean A. Irvine, Oct 16 2015
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STATUS
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approved
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