A051421 - OEIS

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A051421

Number of n-node digraphs with a sink (or, with a source).

1, 1, 2, 12, 185, 8990, 1478644 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	REFERENCES	`F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 218 (incorrect version).` `R. C. Read (rcread(AT)math.uwaterloo.ca), email to N. J. A. Sloane (njas(AT)research.att.com), 28 August, 2000.`
	CROSSREFS	`Sequence in context: A039748 A007764 A015195 * A110105 A094157 A012598` `Adjacent sequences: A051418 A051419 A051420 * A051422 A051423 A051424`
	KEYWORD	`nonn,nice,more`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs)`

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.