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Search: id:A028563
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| 0, 8, 18, 30, 44, 60, 78, 98, 120, 144, 170, 198, 228, 260, 294, 330, 368, 408, 450, 494, 540, 588, 638, 690, 744, 800, 858, 918, 980, 1044, 1110, 1178, 1248, 1320, 1394, 1470, 1548, 1628, 1710, 1794, 1880, 1968, 2058, 2150, 2244
(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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Equals 2*A055999. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 12 2007
a(n)=2*n+a(n-1)+4 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009]
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EXAMPLE
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For n=2, a(2)=2*2+0+4=8; n=3, a(3)=2*3+8+4=18; n=4, a(4)=2*4+18+4=30 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009]
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MAPLE
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a:=n->sum(n, j=8..n): seq(a(n), n=7..51); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 12 2007
with (combinat):seq(fibonacci(3, n)+n-13, n=3..47); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 07 2008
with(finance):seq(add(cashflows([2, k, k], 0 ), k=3..n), n=2..51); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 30 2008
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MATHEMATICA
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lst={}; Do[AppendTo[lst, n*(n+7)], {n, 0, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 06 2008]
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CROSSREFS
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Cf. A002522.
Sequence in context: A085248 A092163 A100592 this_sequence A120091 A098944 A129958
Adjacent sequences: A028560 A028561 A028562 this_sequence A028564 A028565 A028566
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KEYWORD
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nonn
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com)
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