id:A030653 - OEIS Search Results

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n^3*a(n) is number of circles in complex projective plane tangent to three smooth curves of degree n in general position.

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4, 23, 60, 121, 212, 339, 508, 725, 996, 1327, 1724, 2193, 2740, 3371, 4092, 4909, 5828, 6855, 7996, 9257, 10644, 12163, 13820, 15621, 17572, 19679, 21948, 24385, 26996, 29787, 32764, 35933, 39300, 42871, 46652, 50649, 54868, 59315 (list; graph; listen)

	OFFSET	`1,1`
	REFERENCES	`See formula for enumeration of contacts in Fulton-Kleiman-MacPherson (pp. 156-196 of Lect. Notes Math. n.997).`
	FORMULA	`a(n)=n^3+3n^2+3n-3.`
	CROSSREFS	`Sequence in context: A131545 A030716 A106684 this_sequence A085505 A065972 A132112` `Adjacent sequences: A030650 A030651 A030652 this_sequence A030654 A030655 A030656`
	KEYWORD	`nonn,nice`
	AUTHOR	`Paolo Dominici (pl.dm(AT)libero.it)`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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