A000953 Number of free nonplanar polyenoids with n nodes.

1, 5, 24, 109, 465, 1943, 7827, 31095, 121356, 469235, 1797376, 6844290, 25928036

Offset

7,2

References

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

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. [Annotated scanned copy]

Formula

a(n) = A000207(n) - A000942(n). - Sean A. Irvine, Oct 15 2015

Crossrefs

Sequence in context: A008464 A291010 A063001 * A183934 A171310 A225116

Adjacent sequences: A000950 A000951 A000952 * A000954 A000955 A000956

Keyword

nonn,more

Author

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

Extensions

a(16)-a(19) from Sean A. Irvine, Oct 15 2015

Status

approved