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 A172276 #9 Sep 08 2022 08:45:50
%S A172276 0,1,2,4,5,6,8,9,10,12,13,15,16,17,19,20,21,23,24,26,27,28,30,31,32,
%T A172276 34,35,36,38,39,41,42,43,45,46,47,49,50,52,53,54,56,57,58,60,61,62,64,
%U A172276 65,67,68,69,71,72,73,75,76,78,79,80,82,83,84,86,87,89,90,91,93,94,95,97
%N A172276 a(n) = floor(n*(sqrt(13)-sqrt(5))).
%H A172276 Vincenzo Librandi, <a href="/A172276/b172276.txt">Table of n, a(n) for n = 0..1000</a>
%t A172276 With[{c = Sqrt[13] - Sqrt[5]}, Floor[c Range[0, 80]]] (* _Vincenzo Librandi_, Aug 01 2013 *)
%o A172276 (Magma) [Floor(n*(Sqrt(13)-Sqrt(5))): n in [0..80]]; // _Vincenzo Librandi_, Aug 01 2013
%Y A172276 Cf. A172264, A172266-A172270, A172272-A172278.
%K A172276 nonn,easy
%O A172276 0,3
%A A172276 _Vincenzo Librandi_, Jan 30 2010