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Search: id:A111384
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| A111384 |
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Binomial(n,3) - binomial(floor(n/2),3) - binomial(ceiling(n/2),3). |
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+0
4
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| 0, 0, 0, 1, 4, 9, 18, 30, 48, 70, 100, 135, 180, 231, 294, 364, 448, 540, 648, 765, 900, 1045, 1210, 1386, 1584, 1794, 2028, 2275, 2548, 2835, 3150, 3480, 3840, 4216, 4624, 5049, 5508, 5985, 6498, 7030, 7600, 8190, 8820, 9471, 10164, 10879, 11638, 12420, 13248
(list; graph; listen)
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OFFSET
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0,5
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COMMENT
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a(n) is also floor(n/2)*ceiling(n/2)*(n-2)/2 [From James Buddenhagen (jbuddenh(AT)gmail.com), Nov 11 2009]
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REFERENCES
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P. Keevash et al., The Turan number of the Fano plane, Combinatorica, 25 (2005), 561-574.
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MAPLE
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seq(floor(n/2)*ceil(n/2)*(n-2)/2, n=0..50); [From James Buddenhagen (jbuddenh(AT)gmail.com), Nov 11 2009]
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CROSSREFS
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Sequence in context: A008020 A008146 A038098 this_sequence A008219 A008223 A100037
Adjacent sequences: A111381 A111382 A111383 this_sequence A111385 A111386 A111387
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Nov 10 2005
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