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 A050408 a(n) = 117*n^2/2 - 99*n/2 + 1. 1

%I

%S 1,10,136,379,739,1216,1810,2521,3349,4294,5356,6535,7831,9244,10774,

%T 12421,14185,16066,18064,20179,22411,24760,27226,29809,32509,35326,

%U 38260,41311,44479,47764,51166,54685,58321,62074,65944,69931,74035

%N a(n) = 117*n^2/2 - 99*n/2 + 1.

%H Vincenzo Librandi, <a href="/A050408/b050408.txt">Table of n, a(n) for n = 0..10000</a>

%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1).

%F G.f.: ( -1 - 7*x - 109*x^2 ) / (x-1)^3. - _R. J. Mathar_, Jul 01 2011

%o (MAGMA) [117*n^2/2-99*n/2+1: n in [0..45]]; // _Vincenzo Librandi_, Jul 05 2011

%o (PARI) a(n)=117*n^2/2-99*n/2+1 \\ _Charles R Greathouse IV_, Jun 16 2017

%K easy,nonn

%O 0,2

%A Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 22 1999

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Last modified October 23 05:13 EDT 2018. Contains 316519 sequences. (Running on oeis4.)