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A007081
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Number of labeled Eulerian oriented graphs with n nodes.
(Formerly M3009)
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1
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1, 1, 3, 15, 219, 7839, 777069, 208836207, 156458382975, 328208016021561, 1946879656265710431, 32834193098697741359313
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| B. D. McKay, Applications of a technique for labeled enumeration, Congress. Numerantium, 40 (1983), 207-221.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Sequence in context: A145272 A117820 A126453 * A126455 A136466 A114735
Adjacent sequences: A007078 A007079 A007080 * A007082 A007083 A007084
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein (mira(AT)math.berkeley.edu)
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