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A000941 Number of free planar polyenoids with n nodes and symmetry point group C_s. 2
0, 0, 0, 0, 2, 5, 21, 58, 194, 570, 1790, 5434, 16924, 52362, 163784, 512670, 1614406, 5096314, 16150180 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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]

CROSSREFS

Sequence in context: A328689 A039777 A246167 * A000131 A328041 A242785

Adjacent sequences:  A000938 A000939 A000940 * A000942 A000943 A000944

KEYWORD

nonn,more

AUTHOR

E. K. Lloyd (E.K.Lloyd(AT)soton.ac.uk)

EXTENSIONS

Added a(16)-a(19) and title improved by Sean A. Irvine, Oct 13 2015

STATUS

approved

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Last modified March 8 20:52 EST 2021. Contains 341953 sequences. (Running on oeis4.)