A118095 Number of unrooted regular odd-valent planar maps with 8 vertices; maps are considered up to orientation-preserving homeomorphisms and the vertices are of valency 2n+1.

0, 191, 39670362, 4742588317460, 457373823022288900, 39758207592119720043060, 3253001744463113558023410456, 255859318139167527752722081113072

Offset

0,2

Comments

There is a closed formula.

Links

Table of n, a(n) for n=0..7.

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

Crossrefs

Cf. A112946.

Sequence in context: A185716 A084003 A227892 * A155843 A187527 A187698

Adjacent sequences: A118092 A118093 A118094 * A118096 A118097 A118098

Keyword

nonn

Author

Valery A. Liskovets, Apr 13 2006

Status

approved