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A033437
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Number of edges in 5-partite Turan graph of order n.
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11
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0, 0, 1, 3, 6, 10, 14, 19, 25, 32, 40, 48, 57, 67, 78, 90, 102, 115, 129, 144, 160, 176, 193, 211, 230, 250, 270, 291, 313, 336, 360, 384, 409, 435, 462, 490, 518, 547, 577, 608, 640, 672, 705, 739, 774, 810, 846
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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REFERENCES
| Graham et al., Handbook of Combinatorics, Vol. 2, p. 1234.
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LINKS
| Wikipedia, Tur%C3%A1n graph [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 30 2009]
Eric Weisstein's World of Mathematics, Tur%C3%A1n Graph [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 30 2009]
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FORMULA
| G.f.: (x^5+x^4+x^3+x^2)/[(1-x^5)(1-x)^2].
a(n) = SUM(A011558(k)*(n-k): 0<=k<=n). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 30 2009]
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CROSSREFS
| Cf. A002620, A000212, A033436, A033438, A033439, A033440, A033441, A033442, A033443, A033444. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 30 2009]
Sequence in context: A036572 A139328 A134919 * A024928 A079552 A183863
Adjacent sequences: A033434 A033435 A033436 * A033438 A033439 A033440
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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