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A006536 Switching classes of digraphs.
(Formerly M1710)
0
2, 6, 38, 684, 50224, 13946352, 14061131152, 50947324188128, 666754350781269760, 31763991166456912086656, 5550343429517595744902558208, 3581353054755185129132443153728000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

R. C. Read, personal communication.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..12.

R. C. Read, Letter to N. J. A. Sloane, Oct. 29, 1976

CROSSREFS

Cf. A002854, A049313.

Sequence in context: A005738 A055704 A005740 * A057297 A005530 A072191

Adjacent sequences:  A006533 A006534 A006535 * A006537 A006538 A006539

KEYWORD

nonn,nice

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vladeta Jovovic, Jul 22 2000

STATUS

approved

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Last modified October 15 09:40 EDT 2018. Contains 316211 sequences. (Running on oeis4.)