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 A121830 #20 Sep 02 2022 06:07:56
%S A121830 0,0,0,1,1,2,2,2,3,3,4,4,5,5,5,6,6,7,7,8,8,8,9,9,10,10,11,11,11,12,12,
%T A121830 13,13,13,14,14,15,15,16,16,16,17,17,18,18,19,19,19,20,20,21,21,22,22,
%U A121830 22,23,23,24,24,24,25,25,26,26,27,27,27,28,28,29,29,30,30,30,31,31,32
%N A121830 a(n) = floor((Pi - e)*n).
%H A121830 Vincenzo Librandi, <a href="/A121830/b121830.txt">Table of n, a(n) for n = 0..999</a> [Offset shifted by _Georg Fischer_, Sep 02 2022]
%t A121830 Table[Floor[(Pi - E) n], {n, 0, 80}] (* _Vincenzo Librandi_, Feb 21 2013 *)
%Y A121830 Cf. A073244 (Pi-e), A121282.
%K A121830 nonn,easy
%O A121830 0,6
%A A121830 _Mohammad K. Azarian_, Aug 27 2006
%E A121830 Offset corrected by _Mohammad K. Azarian_, Nov 20 2008
%E A121830 Offset changed to 0 by _Georg Fischer_, Sep 02 2022