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A005016
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Certain subgraphs of a directed graph.
(Formerly M3007)
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0
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1, 1, 3, 15, 159, 3903, 214143, 25098495, 6110517759, 3040867308543, 3064498377754623, 6220489664197758975, 25354161321592779612159, 207142125428402158677213183, 3388838467537660347660899221503
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| Andresen, E.; Kjeldsen, K.; On certain subgraphs of a complete transitively directed graph. Discrete Math. 14 (1976), no. 2, 103-119.
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.: Sum(x^n*Product((2^i-1)/(1+(2^i-2)*x),i = 1 .. n),n = 0 .. infinity). - Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 10 2008
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CROSSREFS
| Cf. A005321.
Sequence in context: A136519 A102556 A016065 * A105611 A108975 A097489
Adjacent sequences: A005013 A005014 A005015 * A005017 A005018 A005019
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 10 2008
a(0), a(14) from Max Alekseyev (maxale(AT)gmail.com), May 04 2010
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