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0, 6, 14, 24, 36, 50, 66, 84, 104, 126, 150, 176, 204, 234, 266, 300, 336, 374, 414, 456, 500, 546, 594, 644, 696, 750, 806, 864, 924, 986, 1050, 1116, 1184, 1254, 1326, 1400, 1476, 1554, 1634, 1716, 1800, 1886, 1974, 2064, 2156
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| P. De Geest, Palindromic Quasipronics of the form n(n+x)
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FORMULA
| a(n)=2*n+a(n-1)+4. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]
sum_{n>=1} 1/a(n) = 137/300 = 0.4566666... - R. J. Mathar, Mar 22 2011
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MAPLE
| with (combinat):seq(fibonacci(3, n)+n-7, n=2..46); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 07 2008
with(finance):seq(add(cashflows([2, k, k], 0 ), k=2..n), n=1..51); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 22 2008
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MATHEMATICA
| s=0; lst={s}; Do[s+=n++ +6; AppendTo[lst, s], {n, 0, 6!, 2}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 16 2008]
Table[n(n+5), {n, 0, 100}] (* From Vladimir Joseph Stephan Orlovsky, May 19 2011 *)
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CROSSREFS
| Cf. A104675, A002522.
Sequence in context: A120345 A107400 A104675 * A083657 A010740 A185594
Adjacent sequences: A028554 A028555 A028556 * A028558 A028559 A028560
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KEYWORD
| nonn
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com)
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