This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A066455 #26 Dec 22 2024 20:02:18
%S A066455 1,2,8,25,65,146,292,533,905,1450,2216,3257,4633,6410,8660,11461,
%T A066455 14897,19058,24040,29945,36881,44962,54308,65045,77305,91226,106952,
%U A066455 124633,144425,166490,190996,218117,248033,280930,317000,356441,399457,446258,497060
%N A066455 a(n) = 6*binomial(n,4) + 5*binomial(n,2) - 4*n + 5.
%H A066455 Harry J. Smith, <a href="/A066455/b066455.txt">Table of n, a(n) for n=1,...,1000</a>
%H A066455 M. Azaola and F. Santos, <a href="http://personales.unican.es/santosf/Articulos/">The number of triangulations of the cyclic polytope C(n,n-4)</a>, Discrete Comput. Geom., 27 (2002), 29-48.
%H A066455 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (5,-10,10,-5,1)
%F A066455 G.f.: x*(1-3*x+8*x^2-5*x^3+5*x^4) / (1-x)^5 . - _R. J. Mathar_, Aug 07 2014
%t A066455 LinearRecurrence[{5, -10, 10, -5, 1}, {1, 2, 8, 25, 65}, 50] (* _Vladimir Joseph Stephan Orlovsky_, Feb 21 2012 *)
%o A066455 (PARI) a(n) = { 6*binomial(n, 4) + 5*binomial(n, 2) - 4*n + 5 } \\ _Harry J. Smith_, Feb 15 2010
%o A066455 (Magma) [6*Binomial(n,4)+5*Binomial(n,2)-4*n+5: n in [1..40]]; // _Vincenzo Librandi_, Aug 07 2014
%K A066455 nonn,easy
%O A066455 1,2
%A A066455 _N. J. A. Sloane_, Jan 04 2002