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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; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| 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]
Sequence found by reading the line from 0, in the direction 0, 10,..., in the square spiral whose vertices are the generalized heptagonal numbers A085787. - Omar E. Pol, Sep 10 2011
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LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 0..10000
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FORMULA
| a(n) = A000290(n)*10 = A001105(n)*5 = A033429(n)*2. [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]
a(n)=20*n+a(n-1)-10 (with a(0)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]
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EXAMPLE
| a(1)=20*1+0-10=10; a(2)=20*2+10-10=40; a(3)=20*3+40-10=90 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]
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MAPLE
| seq(10*n^2, n=0..41); # Nathaniel Johnston, Jun 26 2011
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MATHEMATICA
| 10*Range[0, 50]^2 (* From Harvey P. Dale, Apr 20 2011 *)
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CROSSREFS
| 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 * A131037 A071233 A063490
Adjacent sequences: A033580 A033581 A033582 * A033584 A033585 A033586
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Larry Reeves (larryr(AT)acm.org), Nov 08 2001
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