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Turan's upper bound on the number of triangles of a simplicial complex of dimension two for which every minimal non-face has three vertices.

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0, 0, 0, 1, 3, 7, 14, 23, 36, 54, 75, 102, 136, 174, 220, 275, 335, 405, 486, 573, 672, 784, 903, 1036, 1184, 1340, 1512 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`Conjecture 1.2, p. 2 of Frohmader.`
	REFERENCES	`P. Turan, Research Problem, Kozl MTA Mat. Kutato Int. 6(1961)417-423.`
	LINKS	`Andrew Frohmader, More Constructions for Turan's (3, 4)-Conjecture`
	FORMULA	`a(n) = (5/2)(k^3) - (3/2)(k^2) if n = 3k; (5/2)(k^3) + (k^2) - (1/2)k if n = 3k+1; (5/2)(k^3) + (7/2)(k^2) + k if n = 3*k+2.`
	CROSSREFS	`Sequence in context: A146931 A115285 A004232 this_sequence A093523 A123386 A060999` `Adjacent sequences: A140459 A140460 A140461 this_sequence A140463 A140464 A140465`
	KEYWORD	`easy,more,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 27 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.