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A000935
Number of free planar polyenoids with 2n nodes and symmetry point group C_{2h}.
1
0, 1, 2, 7, 20, 63, 191, 598, 1870, 5906
OFFSET
1,3
LINKS
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]
CROSSREFS
Sequence in context: A083379 A216246 A322202 * A035071 A055891 A122877
KEYWORD
nonn,more
AUTHOR
E. K. Lloyd (E.K.Lloyd(AT)soton.ac.uk)
EXTENSIONS
a(8)-a(10) and improved title by Sean A. Irvine, Oct 15 2015
STATUS
approved