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A064199 a(n) = 9*(n-2)^2*(n^2-2*n-1)/2. 1

%I #17 Sep 08 2022 08:45:04

%S 0,9,126,567,1656,3825,7614,13671,22752,35721,53550,77319,108216,

%T 147537,196686,257175,330624,418761,523422,646551,790200,956529,

%U 1147806,1366407,1614816,1895625,2211534,2565351,2959992,3398481

%N a(n) = 9*(n-2)^2*(n^2-2*n-1)/2.

%D L. Berzolari, Allgemeine Theorie der Höheren Ebenen Algebraischen Kurven, Encyclopädie der Mathematischen Wissenschaften mit Einschluss ihrer Anwendungen. Band III_2. Heft 3, Leipzig: B. G. Teubner, 1906. p. 341.

%H Vincenzo Librandi, <a href="/A064199/b064199.txt">Table of n, a(n) for n = 2..1000</a>

%F G.f.: 9*x^3*(1+9*x+3*x^2-x^3)/(1-x)^5. - _Colin Barker_, Feb 28 2012

%t Table[9*(n-2)^2*(n^2-2*n-1)/2,{n,2,40}] (* _Vincenzo Librandi_, Feb 29 2012 *)

%o (Magma) [9*(n-2)^2*(n^2-2*n-1)/2: n in [2..30]]; // _Vincenzo Librandi_, Feb 29 2012

%K nonn,easy

%O 2,2

%A Antreas P. Hatzipolakis (xpolakis(AT)otenet.gr), Sep 22 2001

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Last modified May 13 02:41 EDT 2024. Contains 372497 sequences. (Running on oeis4.)