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A006536
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Switching classes of digraphs.
(Formerly M1710)
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0
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2, 6, 38, 684, 50224, 13946352, 14061131152, 50947324188128, 666754350781269760, 31763991166456912086656, 5550343429517595744902558208, 3581353054755185129132443153728000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| R. C. Read, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Cf. A002854, A049313.
Sequence in context: A005738 A055704 A005740 * A057297 A005530 A072191
Adjacent sequences: A006533 A006534 A006535 * A006537 A006538 A006539
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KEYWORD
| nonn,nice
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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), Jul 22 2000
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