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A135341 Number of unlabeled toroidal cores having n vertices. 0
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 (list; graph; refs; listen; history; text; internal format)
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: A225654 A236747 A194285 * A033665 A104234 A321926

Adjacent sequences:  A135338 A135339 A135340 * A135342 A135343 A135344

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 07 2007

STATUS

approved

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Last modified November 19 22:34 EST 2019. Contains 329323 sequences. (Running on oeis4.)