A135341 Number of unlabeled toroidal cores having n vertices.

1, 0, 0, 2, 1, 1, 0, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 2, 2, 2, 3, 3, 4, 2, 4, 4, 5, 4, 5, 6, 9, 6, 8, 8, 12, 11, 12, 12, 18, 18, 21, 18, 26, 28, 33, 32, 40, 44, 57, 53, 65, 70, 89, 93, 106, 115, 147, 158, 184

Offset

5,4

Links

Table of n, a(n) for n=5..64.

Andrei Gagarin, Gilbert Labelle and Pierre Leroux, Counting unlabeled toroidal graphs with no K_{3,3}-subdivisions, arXiv:math/0509004.

Crossrefs

Sequence in context: A194285 A367623 A336676 * A344299 A033665 A104234

Adjacent sequences: A135338 A135339 A135340 * A135342 A135343 A135344

Keyword

nonn

Author

N. J. A. Sloane, Dec 07 2007

Status

approved