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A000942
Number of free planar polyenoids with n nodes.
2
1, 1, 1, 3, 4, 12, 26, 77, 204, 624, 1817, 5585, 17007, 52803, 164001, 514009, 1615044, 5100324, 16152134, 51324864
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OFFSET
1,4
LINKS
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]
CROSSREFS
Cf.
A197459
(where polyedges may have cycles).
Sequence in context:
A111758
A264484
A343163
*
A255436
A197459
A330659
Adjacent sequences:
A000939
A000940
A000941
*
A000943
A000944
A000945
KEYWORD
nonn
,
more
AUTHOR
E. K. Lloyd (E.K.Lloyd(AT)soton.ac.uk)
EXTENSIONS
More terms from
Sean A. Irvine
, Oct 12 2015
STATUS
approved
