A000941 Number of free planar polyenoids with n nodes and symmetry point group C_s.

0, 0, 0, 0, 2, 5, 21, 58, 194, 570, 1790, 5434, 16924, 52362, 163784, 512670, 1614406, 5096314, 16150180

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: A039777 A246167 A359725 * 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