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A000648
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Number of alkyls C_{n+15} H_{2n+10} (Anthr.) with n carbon atoms.
(Formerly M3045 N1235)
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2
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1, 3, 18, 61, 225, 716, 2272, 6826, 20238, 58552, 167625, 473929, 1330490, 3709591, 10296336, 28466065, 78481065, 215878221, 592832960, 1625887129, 4454936029, 12198071235, 33383810793, 91336813784, 249851178964, 683421422654
(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 15 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) = (r(x)^10+r(x)^2*r(x^2)^4+2*r(x^2)^5)/4, r(x) = A000598(x).
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CROSSREFS
| Cf. A000649.
Sequence in context: A006011 A012779 A074439 * A110689 A027333 A026576
Adjacent sequences: A000645 A000646 A000647 * A000649 A000650 A000651
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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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