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Search: id:A101357
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| 0, 1, 3, 9, 25, 60, 126, 238, 414, 675, 1045, 1551, 2223, 3094, 4200, 5580, 7276, 9333, 11799, 14725, 18165, 22176, 26818, 32154, 38250, 45175, 53001, 61803, 71659, 82650, 94860, 108376, 123288, 139689, 157675, 177345, 198801, 222148, 247494
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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Eric Weisstein's World of Mathematics, Polygonal number
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FORMULA
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a(n) = Sum[i=0, n][(i(i-2)^2+i^2)/2].
a(n)=A004255(n), n>0. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 02 2008]
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MATHEMATICA
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Table[Sum[(i*(i - 2)^2 + i^2)/2, {i, 0, n}], {n, 0, 38}]
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CROSSREFS
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Cf. A060354.
Sequence in context: A112522 A005262 A004255 this_sequence A065971 A145127 A096260
Adjacent sequences: A101354 A101355 A101356 this_sequence A101358 A101359 A101360
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Dec 25 2004
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EXTENSIONS
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More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 12 2006
Edited by Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Aug 01 2007
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