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Search: id:A140677
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| 0, 11, 28, 51, 80, 115, 156, 203, 256, 315, 380, 451, 528, 611, 700, 795, 896, 1003, 1116, 1235, 1360, 1491, 1628, 1771, 1920, 2075, 2236, 2403, 2576, 2755, 2940, 3131, 3328, 3531, 3740, 3955, 4176, 4403, 4636, 4875, 5120, 5371, 5628
(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)=3*n^2 + 8*n.
a(n)=6*n+a(n-1)-1 (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)=6*2+0-1=11; n=3, a(3)=6*3+11-1=28; n=4, a(4)=6*4+28-1=51 [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++ +11; AppendTo[lst, s], {n, 0, 7!, 6}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 19 2008]
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CROSSREFS
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Cf. A033428, A045944, A140676, A067725, A140678, A067707, A140679, A140680, A140681, A140689.
Sequence in context: A030756 A065006 A061952 this_sequence A018944 A061086 A034276
Adjacent sequences: A140674 A140675 A140676 this_sequence A140678 A140679 A140680
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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 22 2008
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