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Search: id:A001340
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| A001340 |
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E.g.f.: 2*exp(x)/(1-x)^3.
(Formerly M1858 N0736)
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+0
4
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| 2, 8, 38, 212, 1370, 10112, 84158, 780908, 8000882, 89763320, 1094915222, 14431179908, 204423631178, 3097603939952, 50001759773870, 856665220770332, 15526612798028258, 296825612428239848, 5969385443426556422, 125983618731675924020, 2784204907403441680442
(list; graph; listen)
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OFFSET
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0,1
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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).
Biondi, E.; Divieti, L.; Guardabassi, G.; Counting paths, circuits, chains and cycles in graphs: A unified approach. Canad. J. Math. 22 1970 22-35.
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CROSSREFS
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Equals 2*A082030(n).
Sequence in context: A047098 A108246 A020031 this_sequence A058786 A096654 A060389
Adjacent sequences: A001337 A001338 A001339 this_sequence A001341 A001342 A001343
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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) and Simon Plouffe (simon.plouffe(AT)gmail.com)
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EXTENSIONS
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Error in description corrected Jan 30 2008
More terms from N. J. A. Sloane (njas(AT)research.att.com), Jan 30 2008
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