A121156 Number of monocyclic skeletons with n carbon atoms and a ring size of 9.

1, 1, 6, 18, 73, 240, 841, 2714, 8758, 27259, 83847, 252929, 754737, 2225129, 6505344, 18867696, 54384446, 155892016, 444839696, 1264336132, 3581584336, 10116577962, 28505061687, 80146304124, 224929999040, 630259883854, 1763574118096, 4928881367449

Offset

9,3

References

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

Links

Andrew Howroyd, Table of n, a(n) for n = 9..200

Crossrefs

Column k=9 of A305059.

Sequence in context: A242278 A129796 A129790 * A057051 A318069 A332939

Adjacent sequences: A121153 A121154 A121155 * A121157 A121158 A121159

Keyword

nonn

Author

Parthasarathy Nambi, Aug 13 2006

Extensions

Terms a(26) and beyond from Andrew Howroyd, May 24 2018

Status

approved