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A153796
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6 times octagonal numbers: 6n(3n-2).
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2
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0, 6, 48, 126, 240, 390, 576, 798, 1056, 1350, 1680, 2046, 2448, 2886, 3360, 3870, 4416, 4998, 5616, 6270, 6960, 7686, 8448, 9246, 10080, 10950, 11856, 12798, 13776, 14790, 15840, 16926, 18048, 19206, 20400, 21630, 22896, 24198
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) = 18n^2 - 12n = A000567(n)*6 = A139267(n)*3 = A152751(n)*2.
a(n)=a(n-1)+36*n-30 (with a(0)=0) [From Vincenzo Librandi, Dec 15 2010]
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MATHEMATICA
| s=0; lst={s}; Do[s+=n; AppendTo[lst, s], {n, 6, 8!, 36}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 03 2009]
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CROSSREFS
| Cf. A000567, A139267, A152751.
Sequence in context: A000252 A078237 A052651 * A167547 A005353 A047927
Adjacent sequences: A153793 A153794 A153795 * A153797 A153798 A153799
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Jan 19 2009
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