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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; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) = n*(n + 19).
a(n)=2*n+a(n-1)+18 (with a(0)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 03 2010]
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EXAMPLE
| a(1)=2*1+0+18=20; a(2)=2*2+20+18=42; a(3)=2*3+42+18=66 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 03 2010]
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MATHEMATICA
| 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
| Cf. A002378, A120071.
Sequence in context: A041794 A041796 A041798 * A075228 A128672 A126251
Adjacent sequences: A132759 A132760 A132761 * A132763 A132764 A132765
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Aug 28 2007
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