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 A010142 #25 Dec 27 2023 00:19:16
%S A010142 7,1,1,4,1,1,14,1,1,4,1,1,14,1,1,4,1,1,14,1,1,4,1,1,14,1,1,4,1,1,14,1,
%T A010142 1,4,1,1,14,1,1,4,1,1,14,1,1,4,1,1,14,1,1,4,1,1,14,1,1,4,1,1,14,1,1,4,
%U A010142 1,1,14,1,1,4,1,1,14,1,1
%N A010142 Continued fraction for sqrt(57).
%H A010142 Harry J. Smith, <a href="/A010142/b010142.txt">Table of n, a(n) for n = 0..20000</a>
%H A010142 G. Xiao, <a href="http://wims.unice.fr/~wims/en_tool~number~contfrac.en.html">Contfrac</a>
%H A010142 <a href="/index/Con#confC">Index entries for continued fractions for constants</a>
%H A010142 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 1).
%e A010142 7.549834435270749697236684806... = 7 + 1/(1 + 1/(1 + 1/(4 + 1/(1 + ...)))). - _Harry J. Smith_, Jun 06 2009
%t A010142 ContinuedFraction[Sqrt[57],300] (* _Vladimir Joseph Stephan Orlovsky_, Mar 07 2011 *)
%t A010142 PadRight[{7},120,{14,1,1,4,1,1}] (* _Harvey P. Dale_, Mar 28 2016 *)
%o A010142 (PARI) { allocatemem(932245000); default(realprecision, 17000); x=contfrac(sqrt(57)); for (n=0, 20000, write("b010142.txt", n, " ", x[n+1])); } \\ _Harry J. Smith_, Jun 06 2009
%Y A010142 Cf. A010510 Decimal expansion. - _Harry J. Smith_, Jun 06 2009
%K A010142 nonn,cofr
%O A010142 0,1
%A A010142 _N. J. A. Sloane_