A121327 Number of fused bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition).

0, 1, 4, 17, 56, 187, 586, 1827, 5562, 16811, 50225, 149135, 439818, 1290975, 3772259, 10983684, 31878940, 92278466, 266481212, 767972142, 2209210615, 6345086203

Offset

4,3

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

Table of n, a(n) for n=4..25.

Crossrefs

Sequence in context: A213577 A255526 A264218 * A317757 A183924 A255271

Adjacent sequences: A121324 A121325 A121326 * A121328 A121329 A121330

Keyword

nonn

Author

N. J. A. Sloane, Aug 27 2006

Status

approved