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A145582 Number of isomorphism classes of rank one toric log del Pezzo surfaces with index L = n. 1
5, 7, 18, 13, 33, 26, 45, 27, 51, 51, 67, 53, 69, 74, 133, 48, 89 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A145581(n) is the number of toric log del Pezzo surfaces with index L = n. Both are in the table for Theorem 1.2, p.4 of Kasprzyk, Kreuzer and Nill.

LINKS

Table of n, a(n) for n=1..17.

Alexander M. Kasprzyk, Maximilian Kreuzer and Benjamin Nill, On the combinatorial classification of toric log del Pezzo surfaces, LMS J. Comput. Math. 13 (2010) 33-46; arXiv:0810.2207 [math.AG], 2008.

Alexander M. Kasprzyk and Benjamin Nill, Chapter 17 Fano polytopes, in: Strings, Gauge Fields, And The Geometry Behind, World Scientific, 2012. See p. 359.

CROSSREFS

Cf. A145581.

Sequence in context: A248480 A243844 A271656 * A034762 A138919 A214414

Adjacent sequences:  A145579 A145580 A145581 * A145583 A145584 A145585

KEYWORD

nonn,more

AUTHOR

Jonathan Vos Post, Oct 14 2008

EXTENSIONS

a(17) from Kasprzyk and Nill (2012) added by Andrey Zabolotskiy, Feb 17 2020

STATUS

approved

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Last modified May 18 08:46 EDT 2021. Contains 343995 sequences. (Running on oeis4.)