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0, 21, 48, 81, 120, 165, 216, 273, 336, 405, 480, 561, 648, 741, 840, 945, 1056, 1173, 1296, 1425, 1560, 1701, 1848, 2001, 2160, 2325, 2496, 2673, 2856, 3045, 3240, 3441, 3648, 3861, 4080, 4305, 4536, 4773, 5016, 5265, 5520, 5781
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) = A028560(n)*3 = 3*n^2 + 18*n = n(3n+18).
a(n)=6*n+a(n-1)+15 (with a(0)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 03 2010]
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EXAMPLE
| a(1)=6*1+0+15=21; a(2)=6*2+21+15=48; a(3)=6*3+48+15=81 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 03 2010]
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MATHEMATICA
| s=0; lst={}; Do[s+=n+1; s+=n+2; s+=n+3; s+=n+4; s+=n+5; s+=n+6; AppendTo[lst, s], {n, 0, 6!, 1}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 30 2008]
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CROSSREFS
| Cf. A028560, A033428, A045944, A140676, A067725, A140677, A140678, A067707, A140679, A140680, A140689.
Sequence in context: A156966 A146705 A146713 * A138179 A020178 A141556
Adjacent sequences: A140678 A140679 A140680 * A140682 A140683 A140684
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 22 2008
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