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0, 19, 40, 63, 88, 115, 144, 175, 208, 243, 280, 319, 360, 403, 448, 495, 544, 595, 648, 703, 760, 819, 880, 943, 1008, 1075, 1144, 1215, 1288, 1363, 1440, 1519, 1600, 1683, 1768, 1855, 1944, 2035, 2128, 2223, 2320, 2419, 2520, 2623, 2728, 2835, 2944, 3055
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history;
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..47.
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FORMULA
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a(n)= (n+9)^2-9^2 = n*(n+18), n>=0.
G.f.: x*(19-17*x)/(1-x)^3.
a(n)=2*n+a(n-1)+17 (with a(0)=0) [From Vincenzo Librandi, Nov 17 2010]
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MAPLE
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seq(n*(n+18), n=0..52); (Deutsch)
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MATHEMATICA
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s=0; lst={}; Do[s+=n; AppendTo[lst, s], {n, 19, 6!, 2}]; lst [From Vladimir Joseph Stephan Orlovsky, Feb 26 2009]
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CROSSREFS
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Cf. A098832.
a(n-9), n>=10, ninth column (used for the n=9 series of the hydrogen atom) of triangle A120070.
Sequence in context: A041716 A041718 A041720 * A164078 A128677 A065349
Adjacent sequences: A098847 A098848 A098849 * A098851 A098852 A098853
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KEYWORD
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nonn,easy
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AUTHOR
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Eugene McDonnell (eemcd(AT)mac.com), Nov 04 2004
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EXTENSIONS
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More terms from Emeric Deutsch, Mar 06 2005
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STATUS
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approved
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