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Search: id:A001342
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| A001342 |
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E.g.f.: 24*exp(x)/(1-x)^5.
(Formerly M5147 N2233)
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+0
2
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| 24, 144, 984, 7584, 65304, 622704, 6523224, 74542464, 923389464, 12331112784, 176656186584, 2703187857504, 44010975525144, 759759305162544, 13863284116261464, 266629052052953664, 5391260831368104984, 114341673457251051024, 2538207055383516388824, 58858819206973874413344
(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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FORMULA
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a(n) = floor( n! * (n^4+6*n^3+17*n^2+20*n+9) * exp(1) ) [From Mark van Hoeij (hoeij(AT)math.fsu.edu), Nov 11 2009]
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CROSSREFS
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Sequence in context: A007900 A059593 A054118 this_sequence A029572 A129923 A064138
Adjacent sequences: A001339 A001340 A001341 this_sequence A001343 A001344 A001345
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KEYWORD
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nonn
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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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