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 A033435 #8 Jul 08 2025 19:51:19
%S A033435 0,81,1490845,2,5,2,1,11,1,1,1,5,1,1,1,1
%N A033435 Continued fraction for Champernowne constant = 0.01234567891011121314...
%t A033435 ContinuedFraction[With[{nn=20,c=Flatten[IntegerDigits/@Range[0,nn]]}, N[ FromDigits[ c]/10^Length[c],Length[c]]],16] (* _Harvey P. Dale_, Apr 10 2013 *)
%Y A033435 Cf. A033307, A030167.
%K A033435 nonn,cofr
%O A033435 0,2
%A A033435 _N. J. A. Sloane_
%E A033435 Next term is very large.