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Search: id:A033583
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| 0, 10, 40, 90, 160, 250, 360, 490, 640, 810, 1000, 1210, 1440, 1690, 1960, 2250, 2560, 2890, 3240, 3610, 4000, 4410, 4840, 5290, 5760, 6250, 6760, 7290, 7840, 8410, 9000, 9610, 10240, 10890, 11560, 12250, 12960, 13690, 14440, 15210, 16000, 16810
(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 a complete 5-partite graph of order 5n, K_n,n,n,n,n. - Roberto E. Martinez II (remartin(AT)fas.harvard.edu), Oct 18 2001
10 times the squares. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]
a(n) = A158187(n) - 1. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 13 2009]
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FORMULA
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a(n) = A000290(n)*10 = A001105(n)*5 = A033429(n)*2. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]
a(n)=20*n+a(n-1)-30 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2009]
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EXAMPLE
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For n=2, a(2)=20*2+0-30=10; n=3, a(3)=20*3+10-30=40; n=4, a(4)=20*4+40-30=90 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2009]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n++ +10; AppendTo[lst, s], {n, 0, 8!, 20}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 17 2008]
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CROSSREFS
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Cf. A033581, A000217, A000290, A033428.
Cf. A001105, A033429. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]
Sequence in context: A108777 A000132 A060317 this_sequence A131037 A071233 A063490
Adjacent sequences: A033580 A033581 A033582 this_sequence A033584 A033585 A033586
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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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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), Nov 08 2001
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