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A006137
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1 + n/2 + 9*n^2/2.
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1
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1, 6, 20, 43, 75, 116, 166, 225, 293, 370, 456, 551, 655, 768, 890, 1021, 1161, 1310, 1468, 1635, 1811, 1996, 2190, 2393, 2605, 2826, 3056, 3295, 3543, 3800, 4066, 4341, 4625, 4918, 5220, 5531, 5851, 6180
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n)=3*a(n-1)-3*a(n-2)+a(n-3), with a(0)=1, a(1)=6 and a(2)=20. [From Paolo P. Lava (paoloplava(AT)gmail.com), Jul 17 2009]
a(n)=a(n-1)+9*n-4 (with a(0)=1) [From Vincenzo Librandi, Nov 18 2010]
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MATHEMATICA
| s = 1; lst = {s}; Do[s += n + 4; AppendTo[lst, s], {n, 1, 350, 9}]; lst [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 11 2009]
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CROSSREFS
| Sequence in context: A094274 A094279 A093913 * A048969 A005564 A011928
Adjacent sequences: A006134 A006135 A006136 * A006138 A006139 A006140
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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