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A121160
Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition).
2
1, 1, 6, 12, 43, 106, 322, 864, 2483, 6829, 19226, 53293, 148866, 413501, 1151506, 3200184, 8901478, 24742852, 68800520, 191275736, 531888416
OFFSET
5,3
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
Sequence in context: A120471 A219522 A034529 * A105863 A052904 A106692
KEYWORD
nonn,more
AUTHOR
Parthasarathy Nambi, Aug 13 2006
EXTENSIONS
More terms from N. J. A. Sloane, Aug 27 2006
STATUS
approved