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Search: id:A121159
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| A121159 |
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Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition). |
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+0
2
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| 1, 4, 16, 53, 175, 547, 1692, 5127, 15408, 45831, 135500, 398186, 1165005, 3394880, 9861048, 28561403, 82525483, 237941827, 684778523, 1967510639
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OFFSET
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6,2
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REFERENCES
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Camden A. Parks and James B. Hendrickson, Enumeration of monocyclic and bicyclic carbon skeletons, J. Chem. Inf. Comput. Sci., vol. 31, 334-339 (1991).
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CROSSREFS
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Sequence in context: A074409 A056589 A074407 this_sequence A134968 A127634 A115108
Adjacent sequences: A121156 A121157 A121158 this_sequence A121160 A121161 A121162
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KEYWORD
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nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 13 2006
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