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Search: id:A028557
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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; listen)
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OFFSET
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0,2
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LINKS
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P. De Geest, Palindromic Quasipronics of the form n(n+x)
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FORMULA
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a(n)=2*n+a(n-1)+2 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
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EXAMPLE
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For n=2, a(2)=2*2+0+2=6; n=3, a(3)=2*3+6+2=14; n=4, a(4)=2*4+14+2=24 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
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MAPLE
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a:=n->sum(n, j=6..n): seq(a(n), n=5..49); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 12 2007
with (combinat):seq(fibonacci(3, n)+n-7, n=2..46); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 07 2008
a:=n->sum(1+sum(1, k=1..n), k=5..n):seq(a(n), n=4...48); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 22 2008
a:=n->sum(k, k=0..n):seq(a(n)+sum(k, k=4..n), n=2..46); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 22 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
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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]
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CROSSREFS
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Cf. A104675.
Cf. A002522.
Sequence in context: A120345 A107400 A104675 this_sequence A083657 A010740 A095794
Adjacent sequences: A028554 A028555 A028556 this_sequence A028558 A028559 A028560
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KEYWORD
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nonn,new
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com)
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