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A000645 Number of alkyls X^{II} C_n H_{2n+1} Y with n carbon atoms.
(Formerly M1209 N0467)
0
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; refs; listen; history; text; internal format)
OFFSET
0,2
REFERENCES
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).
LINKS
G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; line 11 of Table I.
G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; Table 1, line 11. (Annotated scanned copy)
FORMULA
G.f.: A(x) = A000598(x)/(1-A000642(x)).
CROSSREFS
Sequence in context: A307578 A151536 A026269 * A005958 A166516 A230552
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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Last modified April 22 08:40 EDT 2024. Contains 371893 sequences. (Running on oeis4.)