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Search: id:A139578
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| 0, 15, 34, 57, 84, 115, 150, 189, 232, 279, 330, 385, 444, 507, 574, 645, 720, 799, 882, 969, 1060, 1155, 1254, 1357, 1464, 1575, 1690, 1809, 1932, 2059, 2190, 2325, 2464, 2607, 2754, 2905, 3060, 3219, 3382, 3549, 3720, 3895, 4074
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=2*n^2+13*n.
a(n)=4*n+a(n-1)+7 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009]
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EXAMPLE
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For n=2, a(2)=4*2+0+7=15; n=3, a(3)=4*3+15+7=34; n=4, a(4)=4*4+34+7=57 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n++ +15; AppendTo[lst, s], {n, 0, 7!, 4}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 19 2008]
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CROSSREFS
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Cf. A014105, A014106, A033537, A130861, A139576, A139577, A139579, A139580, A139581.
Sequence in context: A020184 A108517 A085803 this_sequence A156662 A027443 A111170
Adjacent sequences: A139575 A139576 A139577 this_sequence A139579 A139580 A139581
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), May 19 2008
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