A112948 - OEIS

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A112948

Number of unrooted regular planar maps of valency 3 with 2n vertices (considered up to orientation-preserving homeomorphisms).

2, 6, 26, 191, 1904, 22078, 282388, 3848001, 54953996, 814302292 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`Z. C. Gao, V. A. Liskovets and N. C. Wormald, Enumeration of unrooted odd-valent regular planar maps, Preprint, 2005.`
	EXAMPLE	`There exist 2 planar maps with two 3-valent vertices: a map with three parallel edges and a map with one loop in each vertex and a link. Therefore a(1)=2.`
	CROSSREFS	`Cf. A112944, A112945, A112949, A005470.` `Sequence in context: A059430 A086584 A032014 * A007139 A162438 A137071` `Adjacent sequences: A112945 A112946 A112947 * A112949 A112950 A112951`
	KEYWORD	`nonn`
	AUTHOR	`Valery A. Liskovets (liskov(AT)im.bas-net.by), Oct 10 2005`

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Last modified February 17 10:05 EST 2012. Contains 206009 sequences.