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A028566 n(n+8). +0
6
0, 9, 20, 33, 48, 65, 84, 105, 128, 153, 180, 209, 240, 273, 308, 345, 384, 425, 468, 513, 560, 609, 660, 713, 768, 825, 884, 945, 1008, 1073, 1140, 1209, 1280, 1353, 1428, 1505, 1584, 1665, 1748, 1833, 1920, 2009, 2100, 2193, 2288, 2385 (list; graph; listen)
OFFSET

0,2

LINKS

P. De Geest, Palindromic Quasipronics of the form n(n+x)

FORMULA

a(n)= (n+4)^2 -4^2 = n*(n+8), n>=0.

G.f.: x*(9-7*x)/(1-x)^3.

MAPLE

a:=n->sum(n, j=9..n): seq(a(n), n=8..53); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 12 2007

CROSSREFS

a(n-4), n>=5, fourth column (used for the Brackett series of the hydrogen atom) of triangle A120070.

Adjacent sequences: A028563 A028564 A028565 this_sequence A028567 A028568 A028569

Sequence in context: A094196 A017497 A059108 this_sequence A128153 A109805 A013573

KEYWORD

nonn

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com)

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Last modified May 17 13:36 EDT 2008. Contains 139908 sequences.


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