A000942 Number of free planar polyenoids with n nodes.

1, 1, 1, 3, 4, 12, 26, 77, 204, 624, 1817, 5585, 17007, 52803, 164001, 514009, 1615044, 5100324, 16152134, 51324864

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