A000935 Number of free planar polyenoids with 2n nodes and symmetry point group C_{2h}.

0, 1, 2, 7, 20, 63, 191, 598, 1870, 5906

Offset

1,3

Links

Table of n, a(n) for n=1..10.

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

Adjacent sequences: A000932 A000933 A000934 * A000936 A000937 A000938

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