A112950 Number of unrooted regular planar maps of valency 7 with 2n vertices (considered up to orientation-preserving homeomorphisms).

39, 80600, 513654400, 4742588317460, 53786496621600480, 696401295433093120200, 9891028759926839453714800, 150420303869075439022288355100, 2410984386008752279281147366400400

Offset: 1

Author

Valery A. Liskovets, Oct 10 2005

Keywords

• nonn

Comments

No closed formula is known.

Links

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

Crossrefs

Cf. A112949.