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Search: id:A033582
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| 0, 7, 28, 63, 112, 175, 252, 343, 448, 567, 700, 847, 1008, 1183, 1372, 1575, 1792, 2023, 2268, 2527, 2800, 3087, 3388, 3703, 4032, 4375, 4732, 5103, 5488, 5887, 6300, 6727, 7168, 7623, 8092, 8575, 9072
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Number of edges of the complete bipartite graph of order 8n, K_n,7n - Roberto E. Martinez II (remartin(AT)fas.harvard.edu), Jan 07 2002
Number of edges of the complete tripartite graph of order 5n, K_n,n,3n - Roberto E. Martinez II (remartin(AT)fas.harvard.edu), Jan 07 2002
7 times the squares. [From Omar E. Pol (info(AT)polprimos.com), Dec 11 2008]
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FORMULA
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Central terms of the triangle in A132111: a(n)=A132111(2*n,n). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 10 2007
a(n) = A000290(n)*7. [From Omar E. Pol (info(AT)polprimos.com), Dec 11 2008]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n++ +7; AppendTo[lst, s], {n, 0, 8!, 14}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 16 2008]
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CROSSREFS
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Cf. A000290. [From Omar E. Pol (info(AT)polprimos.com), Dec 11 2008]
Sequence in context: A078307 A045551 A024844 this_sequence A008457 A138503 A064951
Adjacent sequences: A033579 A033580 A033581 this_sequence A033583 A033584 A033585
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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