id:A053598 - OEIS Search Results

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Number of n-node unlabeled digraphs without isolated nodes.

+0
2

0, 2, 13, 202, 9390, 1531336, 880492496, 1792477159408, 13026163465206704, 341247403996148180800, 32522568124623933138617088, 11366712907916015518547782806784 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Equals first differences of A000273.`
	CROSSREFS	`Cf. A002494.` `Sequence in context: A049512 A003507 A003085 this_sequence A102585 A078702 A069569` `Adjacent sequences: A053595 A053596 A053597 this_sequence A053599 A053600 A053601`
	KEYWORD	`nonn,nice`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 10 2000`

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Last modified December 6 13:45 EST 2009. Contains 170429 sequences.

AT&T Labs Research