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A113203 Number of isomorphism classes of simple quadrangulations of the sphere having n vertices and n-2 faces, minimal degree 3, with orientation-reversing isomorphisms forbidden. 2
1, 0, 1, 1, 4, 3, 16, 26, 99, 256, 895, 2789, 9740, 32799, 115024, 401180, 1421170, 5046539, 18066772, 64940825, 234712099, 851801048, 3104690139, 11358900851, 41710948878, 153684688127, 568079430741, 2106188450292 (list; graph; refs; listen; history; text; internal format)
OFFSET

8,5

LINKS

Table of n, a(n) for n=8..35.

G. Brinkmann, S. Greenberg, C. Greenhill, B. D. McKay, R. Thomas, and P. Wollan, Generation of simple quadrangulations of the sphere, Discr. Math., 305 (2005), 33-54.

Gunnar Brinkmann and Brendan McKay, plantri and fullgen programs for generation of certain types of planar graph.

Gunnar Brinkmann and Brendan McKay, plantri and fullgen programs for generation of certain types of planar graph [Cached copy, pdf file only, no active links, with permission]

CombOS - Combinatorial Object Server, generate planar graphs

CROSSREFS

Cf. A113201, A078666, A007022, A002880, A113202, A113204, A113205.

Sequence in context: A176737 A046162 A060509 * A034486 A130515 A302851

Adjacent sequences:  A113200 A113201 A113202 * A113204 A113205 A113206

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 07 2006

STATUS

approved

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Last modified December 13 12:45 EST 2019. Contains 329968 sequences. (Running on oeis4.)