A107278 Number of spiro bicyclic skeletons with n carbon atoms.

1, 4, 17, 60, 209, 685, 2204, 6913, 21387, 65241, 197104, 590284, 1755804, 5191723, 15276610, 44761350, 130682371, 380337474, 1103927291, 3196494453

Offset: 6

Author

N. J. A. Sloane, Sep 10 2006

Keywords

• nonn

Comments

See Parks et al. for precise definition. Sequence is last column of table III.

Links

• Camden A. Parks and James B. Hendrickson, Enumeration of monocyclic and bicyclic carbon skeletons, J. Chem. Inf. Comput. Sci., vol. 31, 334-339 (1991).

Crossrefs

Table III of the Parks et al. reference has 4 sequences: A121158, A121159, A121160 and this sequence.

Extensions

Incorrect g.f. removed by Georg Fischer, May 24 2019