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 A131476 #35 Feb 08 2023 15:48:37
%S A131476 0,0,2,9,21,41,72,114,170,243,333,443,576,732,914,1125,1365,1637,1944,
%T A131476 2286,2666,3087,3549,4055,4608,5208,5858,6561,7317,8129,9000,9930,
%U A131476 10922,11979,13101,14291,15552,16884,18290,19773,21333,22973
%N A131476 a(n) = floor(n^3/3).
%H A131476 Vincenzo Librandi, <a href="/A131476/b131476.txt">Table of n, a(n) for n = 0..1000</a>
%H A131476 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,2,-3,3,-1).
%F A131476 From _R. J. Mathar_, Dec 19 2008: (Start)
%F A131476 G.f.: x^2*(2 + 3*x + x^3)/((1 - x)^4*(1 + x + x^2)).
%F A131476 a(n) = (A057078(n) - A024001(n))/3. (End)
%F A131476 a(n) = (3*n^3 + 3*cos(2*Pi*n/3) + sqrt(3)*sin(2*Pi*n/3) - 3)/9. - _Vladimir Reshetnikov_, Oct 09 2016
%F A131476 a(n) = (n - 1)*n*(n + 1)/3 + floor(n/3). - _Bruno Berselli_, Jun 08 2017
%t A131476 Table[Quotient[n^3,3],{n,0,80}] (* _Vladimir Joseph Stephan Orlovsky_, May 07 2011 *)
%o A131476 (Magma) [Floor(n^3/3): n in [0..50]]; // _Vincenzo Librandi_, May 08 2011
%o A131476 (PARI) a(n)=n^3\3 \\ _Charles R Greathouse IV_, May 08 2011
%Y A131476 Cf. A000982, A008619, A004526, A007590, A036487.
%K A131476 nonn,easy
%O A131476 0,3
%A A131476 _Mohammad K. Azarian_, Jul 27 2007