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

6,2

Comments

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

Links

Table of n, a(n) for n=6..25.

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.

Sequence in context: A027075 A202974 A034331 * A006762 A297917 A202752

Adjacent sequences: A107275 A107276 A107277 * A107279 A107280 A107281

Keyword

nonn

Author

N. J. A. Sloane, Sep 10 2006

Extensions

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

Status

approved