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Search: id:A000645
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| A000645 |
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Number of alkyls X^{II} C_n H_{2n+1} Y with n carbon atoms.
(Formerly M1209 N0467)
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+0
1
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| 1, 2, 4, 10, 25, 64, 166, 437, 1157, 3087, 8276, 22287, 60230, 163284, 443820, 1209155, 3300890, 9027337, 24727437, 67829684, 186302693, 512301120, 1410237805, 3885803531, 10716571591, 29579231200, 81704634803, 225845362116
(list; graph; listen)
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OFFSET
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0,2
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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).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; line 11 of Table I.
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FORMULA
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G.f.: A(x) = A000598(x)/(1-A000642(x)).
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CROSSREFS
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Sequence in context: A036887 A151536 A026269 this_sequence A005958 A166516 A124500
Adjacent sequences: A000642 A000643 A000644 this_sequence A000646 A000647 A000648
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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