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A121327 Number of fused bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition). 0
0, 1, 4, 17, 56, 187, 586, 1827, 5562, 16811, 50225, 149135, 439818, 1290975, 3772259, 10983684, 31878940, 92278466, 266481212, 767972142, 2209210615, 6345086203 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 16 21:13 EDT 2019. Contains 324155 sequences. (Running on oeis4.)