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 A114763 #16 Sep 08 2022 08:45:23
%S A114763 4,484,49729,4999696,499969600,49999643236,4999995628489,
%T A114763 499999965341041,49999999664599209,4999999997764872529,
%U A114763 499999999955372691076,49999999999562191467001,4999999999996468370295001,499999999999959886546350009,49999999999999566363399000484
%N A114763 a(n) = floor(sqrt(5)*10^n)^2.
%C A114763 Largest square < 5*10^(2n).
%e A114763 a(1) = floor(sqrt(5)*10)^2 = 22^2 = 484.
%t A114763 With[{c=Sqrt[5]},(Floor[c 10^#])^2&/@Range[0,30]] (* _Harvey P. Dale_, Feb 27 2011 *)
%o A114763 (Magma) [Floor(5^(1/2)*10^n)^2: n in [0..150]]; // _Vincenzo Librandi_, Feb 05 2011
%Y A114763 Cf. A114761, A114762.
%K A114763 nonn
%O A114763 0,1
%A A114763 _Amarnath Murthy_, Nov 17 2005
%E A114763 More terms from _Joshua Zucker_, May 05 2006