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A000948 Number of free nonplanar polyenoids with n nodes and symmetry point group C_s. 1
0, 3, 20, 99, 450, 1896, 7771, 30895, 121144, 468409, 1796584, 6841014, 25925062 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Table of n, a(n) for n=7..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]

FORMULA

a(n) = A000131(n+2) - A000941(n). - Sean A. Irvine, Oct 15 2015

CROSSREFS

Sequence in context: A278319 A305203 A246150 * A165960 A074831 A203357

Adjacent sequences:  A000945 A000946 A000947 * A000949 A000950 A000951

KEYWORD

nonn,more

AUTHOR

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

EXTENSIONS

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

STATUS

approved

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Last modified October 15 05:43 EDT 2019. Contains 328026 sequences. (Running on oeis4.)