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 A121899 #26 Sep 08 2022 08:45:27
%S A121899 0,6,9,11,12,14,15,16,17,18,19,20,21,22,22,23,24,25,25,26,27,27,28,29,
%T A121899 29,30,30,31,32,32,33,33,34,34,35,35,36,36,37,37,38,38,38,39,39,40,40,
%U A121899 41,41,42,42,42,43,43,44,44,44,45,45,46,46,46,47,47,47,48,48,48,49,49
%N A121899 a(n) = ceiling((Pi + e)*sqrt(n)).
%H A121899 Vincenzo Librandi, <a href="/A121899/b121899.txt">Table of n, a(n) for n = 0..999</a> [Offset shifted by _Georg Fischer_, Sep 02 2022]
%t A121899 Table[Ceiling[(Pi + E) Sqrt[n]], {n, 0, 70}] (* _Vincenzo Librandi_, Feb 21 2013 *)
%o A121899 (PARI) for(n=0,50, print1(ceil((exp(1)+Pi)*sqrt(n)), ", ")) \\ _G. C. Greubel_, Oct 28 2017
%o A121899 (Magma) C<i> := ComplexField(); [Ceiling((Exp(1) + Pi(C))*Sqrt(n)): n in [0..50]]; // _G. C. Greubel_, Oct 28 2017
%Y A121899 Cf. A059742 (Pi+e), A121854, A121855, A121856, A121857.
%K A121899 nonn,easy
%O A121899 0,2
%A A121899 _Mohammad K. Azarian_, Sep 01 2006
%E A121899 Offset corrected by _Mohammad K. Azarian_, Nov 20 2008
%E A121899 Offset changed to 0 by _Georg Fischer_, Sep 02 2022