A099686 - OEIS

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A099686

Consider the family of multigraphs enriched by the species of quaternary sets. Sequence gives number of those multigraphs with 4n loops and arcs.

1, 2, 457, 941987, 8153027092, 208426400639147 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,2`
	REFERENCES	G. Paquin, D\'enombrement de multigraphes enrichis, M\'emoire, Math. Dept., Univ. Qu\'ebec \`a Montr\'eal, 2004.
	LINKS	`Table of n, a(n) for n=0..5.`
	CROSSREFS	`Sequence in context: A159513 A012730 A012734 * A066152 A112862 A094484` `Adjacent sequences: A099683 A099684 A099685 * A099687 A099688 A099689`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane, Oct 26 2004`
	STATUS	`approved`

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Last modified May 21 04:06 EDT 2013. Contains 225474 sequences.