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Search: id:A140676
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| 0, 7, 20, 39, 64, 95, 132, 175, 224, 279, 340, 407, 480, 559, 644, 735, 832, 935, 1044, 1159, 1280, 1407, 1540, 1679, 1824, 1975, 2132, 2295, 2464, 2639, 2820, 3007, 3200, 3399, 3604, 3815, 4032, 4255, 4484, 4719, 4960, 5207, 5460
(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 + 4n.
a(n)=6*n+a(n-1)-5 (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+0-5=7; n=3, a(3)=6*3+7-5=20; n=4, a(4)=6*4+20-5=39 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009]
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MATHEMATICA
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lst={}; Do[AppendTo[lst, n*(3*n+4)], {n, 0, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 06 2008]
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CROSSREFS
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Cf. A033428, A045944, A067725, A140677, A140678, A067707, A140679, A140680, A140681, A140689.
Sequence in context: A134863 A063235 A063151 this_sequence A025056 A038349 A100752
Adjacent sequences: A140673 A140674 A140675 this_sequence A140677 A140678 A140679
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KEYWORD
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easy,nonn,new
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), May 22 2008
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