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A033541 Number of irreducible exceptional curves of first kind on del Pezzo surface of degree 9-n. +0
1
0, 1, 3, 6, 10, 16, 27, 56, 240 (list; graph; listen)
OFFSET

0,3

COMMENT

The case n=1 is exceptional, and a(1) could be 0 or 1.

REFERENCES

Yu. I. Manin, Rational surfaces and Galois cohomology, pp. 495-509 of Proc. International Congress Mathematicians, Moscow 1966.

M. Nagata, On rational surfaces, I, II, Mem. Coll. Sci. Univ. Kyoto, Ser. A., XXXII (No. 3, 1960) and XXXIII (No. 2, 1960).

CROSSREFS

Sequence in context: A054886 A130578 A107068 this_sequence A038505 A119971 A094272

Adjacent sequences: A033538 A033539 A033540 this_sequence A033542 A033543 A033544

KEYWORD

fini,full,nonn

AUTHOR

njas, Feb 13 2002

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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