A003028 - OEIS

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A003028

Number of n-node digraphs with a source.
(Formerly M3157)

1, 3, 51, 3614, 991930, 1051469032, 4366988803688, 71895397383029040, 4719082081411731363408, 1237678715644664931691596416, 1297992266840866792981316221144960 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	REFERENCES	`V. Jovovic and G. Kilibarda, Enumeration of labeled initially-finally connected digraphs, Scientific review, Serbian Scientific Society, 19-20 (1996) 237-247.` `R. W. Robinson, Counting labeled acyclic digraphs, pp. 239-273 of F. Harary, editor, New Directions in the Theory of Graphs. Academic Press, NY, 1973.` `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..11.` `V. Jovovic and G. Kilibarda, Enumeration of labeled quasi-initially connected digraphs, Discrete Math., 224 (2000), 151-163.`
	CROSSREFS	`Sequence in context: A172434 A210676 A105639 * A069343 A084882 A275798` `Adjacent sequences: A003025 A003026 A003027 * A003029 A003030 A003031`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`N. J. A. Sloane.`
	EXTENSIONS	`Corrected and extended by Vladeta Jovovic, Goran Kilibarda`
	STATUS	`approved`

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Last modified September 27 08:16 EDT 2021. Contains 347689 sequences. (Running on oeis4.)