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

1,1

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: A268072 A268422 A367524 * A173364 A023931 A067159

Adjacent sequences: A112947 A112948 A112949 * A112951 A112952 A112953

Keyword

nonn

Author

Valery A. Liskovets, Oct 10 2005

Status

approved