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Search: id:A000641
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| A000641 |
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Number of paraffins C_n H_{2n-1} X_3 with n carbon atoms.
(Formerly M1456 N0575)
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+0
1
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| 0, 1, 2, 5, 14, 39, 109, 312, 890, 2552, 7325, 21047, 60465, 173750, 499068, 1433071, 4113105, 11799780, 33834367, 96968462, 277771344, 795310628, 2276055442, 6510786627, 18616389094, 53207964655, 152014267327, 434136228215
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OFFSET
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0,3
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REFERENCES
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G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; line 7 of Table I.
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FORMULA
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G.f.: A(x) = ((x*r)/6)*( 1/(1-x*R)^3 + 3/((1-x*R)*(1-x^2*R2)) + 2/(1-x^3*R3)); r = A000598(x), R=A000642(x)/x, Ri=R(x^i).
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CROSSREFS
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Adjacent sequences: A000638 A000639 A000640 this_sequence A000642 A000643 A000644
Sequence in context: A001011 A141752 A132834 this_sequence A026135 A105641 A027035
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KEYWORD
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nonn,easy
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AUTHOR
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njas
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