A051504 - OEIS

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A051504

Number of asymmetric digraphs with n nodes.

1, 1, 1, 7, 136, 8001, 1445297 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	REFERENCES	`F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 231.` `P. K. Stockmeyer, The enumeration of graphs with prescribed automorphism group, Dissertation, Univ. of Michigan, Ann Arbor, 1971.`
	CROSSREFS	`Cf. A000273 (digraphs), A003400 (asymmetric graphs), A030242 (asymmetric relations)` `Sequence in context: A143181 A183478 A081793 * A058881 A100520 A009701` `Adjacent sequences: A051501 A051502 A051503 * A051505 A051506 A051507`
	KEYWORD	`hard,nonn,nice`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs)`
	EXTENSIONS	`a(6) from Christian G. Bower (bowerc(AT)usa.net) Dec 15 1999.`

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Last modified February 15 13:45 EST 2012. Contains 205806 sequences.