A135340 Number of labeled non-planar projective-planar 2-connected K_{3,3}-free homeomorphically irreducible graphs with n vertices.

1, 0, 420, 36960, 3651480, 453448800, 67528553400, 11697130922400, 2306595939347700, 509359060543132800, 124356566550728011500, 33226132945543622884800, 9635384706205021006042800

Offset

5,3

Links

A. Gagarin et al., Table of n, a(n) for n = 5..20

A. Gagarin, G. Labelle and P. Leroux, Counting labeled projective-planar graphs without a K_{3,3}-subdivision, arXiv:math/0406140 [math.CO], 2004-2006.

Crossrefs

Cf. A104592, A104593.

Sequence in context: A289348 A107510 A023911 * A135380 A035846 A223941

Adjacent sequences: A135337 A135338 A135339 * A135341 A135342 A135343

Keyword

nonn

Author

N. J. A. Sloane, Dec 07 2007

Status

approved