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A005999
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Number of paraffins.
(Formerly M1577)
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0
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1, 2, 6, 11, 23, 38, 64, 95, 141, 194, 266, 347, 451, 566, 708, 863, 1049, 1250, 1486, 1739, 2031, 2342, 2696, 3071, 3493, 3938, 4434, 4955, 5531, 6134, 6796, 7487, 8241, 9026, 9878, 10763, 11719, 12710, 13776
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| S. M. Losanitsch, Die Isomerie-Arten bei den Homologen der Paraffin-Reihe, Chem. Ber. 30 (1897), 1917-1926.
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.: (x^5+2*x^4+x^3+x^2+1)/(-1+x)^2/(-1+x^2)^2.
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CROSSREFS
| Sequence in context: A083322 A073939 A085264 * A102429 A080012 A103143
Adjacent sequences: A005996 A005997 A005998 * A006000 A006001 A006002
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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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