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A121159 Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition). 1
1, 4, 16, 53, 175, 547, 1692, 5127, 15408, 45831, 135500, 398186, 1165005, 3394880, 9861048, 28561403, 82525483, 237941827, 684778523, 1967510639 (list; graph; refs; listen; history; internal format)
OFFSET

6,2

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).

CROSSREFS

Sequence in context: A056589 A074407 A192074 * A134968 A127634 A115108

Adjacent sequences:  A121156 A121157 A121158 * A121160 A121161 A121162

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 13 2006

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Last modified February 16 20:14 EST 2012. Contains 205962 sequences.