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A112950 Number of unrooted regular planar maps of valency 7 with 2n vertices (considered up to orientation-preserving homeomorphisms). 2
39, 80600, 513654400, 4742588317460, 53786496621600480, 696401295433093120200, 9891028759926839453714800, 150420303869075439022288355100, 2410984386008752279281147366400400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

No closed formula is known.

LINKS

Table of n, a(n) for n=1..9.

Z. C. Gao, V. A. Liskovets and N. C. Wormald, Enumeration of unrooted odd-valent regular planar maps, Preprint, 2005.

CROSSREFS

Cf. A112949.

Sequence in context: A115462 A268072 A268422 * A173364 A023931 A067159

Adjacent sequences:  A112947 A112948 A112949 * A112951 A112952 A112953

KEYWORD

nonn

AUTHOR

Valery A. Liskovets, Oct 10 2005

STATUS

approved

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Last modified May 6 09:25 EDT 2021. Contains 343580 sequences. (Running on oeis4.)