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 A011905 #22 Oct 18 2024 06:08:35
%S A011905 0,0,0,0,1,2,5,9,14,21,31,43,57,74,94,118,146,177,212,252,297,346,401,
%T A011905 462,528,600,678,763,854,953,1059,1172,1293,1423,1561,1707,1862,2026,
%U A011905 2200,2384,2577,2780,2994,3219,3454,3701,3960,4230,4512,4806,5113,5432,5765,6111,6470,6843,7231,7633,8049,8480,8926,9388,9866,10359,10868,11394,11937,12496,13073
%N A011905 a(n) = floor( n*(n-1)*(n-2)/23 ).
%H A011905 G. C. Greubel, <a href="/A011905/b011905.txt">Table of n, a(n) for n = 0..2000</a>
%H A011905 <a href="/index/Rec#order_26">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,-3,3,-1).
%F A011905 G.f.: x^4*(1+x*(-1+x*(2+x*(-1+x^2*(1+(-1+x)*x^2)*(1+x+x^6+x^10+x^13))))) /(1+x*(-3+x*(3+x*(-1+(-1+x)^3*x^20)))). - _Peter J. C. Moses_, Jun 02 2014
%t A011905 Table[Floor[(n(n-1)(n-2))/23],{n,0,75}] (* _Harvey P. Dale_, Aug 06 2013 *)
%o A011905 (Magma) [Floor(6*Binomial(n,3)/23): n in [0..75]]; // _G. C. Greubel_, Oct 18 2024
%o A011905 (SageMath) [6*binomial(n,3)//23 for n in range(76)] # _G. C. Greubel_, Oct 18 2024
%Y A011905 Cf. A011886.
%K A011905 nonn,easy
%O A011905 0,6
%A A011905 _N. J. A. Sloane_
%E A011905 More terms added by _G. C. Greubel_, Oct 18 2024