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Search: id:A132762
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| 0, 20, 42, 66, 92, 120, 150, 182, 216, 252, 290, 330, 372, 416, 462, 510, 560, 612, 666, 722, 780, 840, 902, 966, 1032, 1100, 1170, 1242, 1316, 1392, 1470, 1550, 1632, 1716, 1802, 1890, 1980, 2072, 2166, 2262, 2360, 2460, 2562, 2666
(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) = n*(n + 19).
a(n)=2*n+a(n-1)+16 (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)=2*2+0+16=20; n=3, a(3)=2*3+20+16=42; n=4, a(4)=2*4+42+16=66 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009]
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MATHEMATICA
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s=0; lst={}; Do[s+=n; AppendTo[lst, s], {n, 20, 6!, 2}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Feb 26 2009]
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CROSSREFS
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Cf. A002378, A120071.
Sequence in context: A041794 A041796 A041798 this_sequence A075228 A128672 A126251
Adjacent sequences: A132759 A132760 A132761 this_sequence A132763 A132764 A132765
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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), Aug 28 2007
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