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A000646
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Number of alkyls Y^{II} C_n H_{2n+2} with n carbon atoms.
(Formerly M0800 N0303)
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0
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1, 2, 3, 6, 13, 28, 62, 144, 338, 810, 1970, 4852, 12073, 30334, 76805, 195850, 502461, 1296122, 3359527, 8745744, 22856223, 59944156, 157718380, 416189954, 1101204387, 2920914484, 7765357967, 20688204244, 55225188289, 147688302518
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; line 12 of Table I.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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FORMULA
| G.f.: A(x) = A000598(x)^2.
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CROSSREFS
| Sequence in context: A032143 A032160 A089735 * A197463 A032048 A032066
Adjacent sequences: A000643 A000644 A000645 * A000647 A000648 A000649
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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