A100548 - OEIS

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A100548

Number of n-node labeled digraphs without endpoints.

1, 1, 1, 28, 2539, 847126, 987474781, 4267529230672, 71328353711113801, 4706871807383903992060, 1236666872833000506726110479, 1297665884376581511952494336126664 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	FORMULA	`E.g.f.: exp(3/2x^2)Sum(2^(n(n-1))(x/exp(3*x))^n/n!, n=0..infinity).`
	CROSSREFS	`Cf. A059167.` `Sequence in context: A203751 A178187 A184134 * A103660 A107444 A061787` `Adjacent sequences: A100545 A100546 A100547 * A100549 A100550 A100551`
	KEYWORD	`nonn`
	AUTHOR	`Goran Kilibarda, Zoran Maksimovic, Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 02 2005`

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Last modified February 17 04:58 EST 2012. Contains 205985 sequences.