id:A053467 - OEIS Search Results

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Number of directed 2-multigraphs on n nodes.

+0
4

1, 6, 138, 22815, 29197989, 286181094816, 21712697070199704, 12980080058620326927885, 62082385554465497895132149640, 2405193620328895144597707267893468286 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A 2-multigraph is similar to an ordinary graph except there are 0, 1 or 2 edges between any two nodes (self-loops are not allowed).`
	CROSSREFS	`Cf. A000273.` `Sequence in context: A075185 A003994 A155558 this_sequence A090944 A007340 A122483` `Adjacent sequences: A053464 A053465 A053466 this_sequence A053468 A053469 A053470`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 13 2000`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

AT&T Labs Research