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Search: id:A002986
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| A002986 |
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Number of non-cyclic hydrocarbons with n carbon atoms.
(Formerly M2376)
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+0
3
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| 1, 3, 4, 12, 27, 84, 247, 826, 2777, 9868, 35579
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
R. C. Read, Some recent results in chemical enumeration, Lect. Notes Math. 303 (1972), 243-259.
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LINKS
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Vesa Linja-aho, Web site
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CROSSREFS
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Sequence in context: A111758 A000942 A000207 this_sequence A147569 A090660 A000208
Adjacent sequences: A002983 A002984 A002985 this_sequence A002987 A002988 A002989
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KEYWORD
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nonn,hard,more
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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Better definition from Sergio Pimentel (ferdiego(AT)cox.net), Apr 28 2006
a(11) (computed using Nauty) from Vesa Linja-aho (vesa.linja-aho(AT)tkk.fi), Apr 24 2008
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