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 A010138 #25 Dec 27 2023 00:14:54
%S A010138 7,4,1,2,1,4,14,4,1,2,1,4,14,4,1,2,1,4,14,4,1,2,1,4,14,4,1,2,1,4,14,4,
%T A010138 1,2,1,4,14,4,1,2,1,4,14,4,1,2,1,4,14,4,1,2,1,4,14,4,1,2,1,4,14,4,1,2,
%U A010138 1,4,14,4,1,2,1,4,14,4,1
%N A010138 Continued fraction for sqrt(52).
%H A010138 Harry J. Smith, <a href="/A010138/b010138.txt">Table of n, a(n) for n = 0..20000</a>
%H A010138 G. Xiao, <a href="http://wims.unice.fr/~wims/en_tool~number~contfrac.en.html">Contfrac</a>
%H A010138 <a href="/index/Con#confC">Index entries for continued fractions for constants</a>
%H A010138 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 1).
%e A010138 7.211102550927978586238442534... = 7 + 1/(4 + 1/(1 + 1/(2 + 1/(1 + ...)))). - _Harry J. Smith_, Jun 06 2009
%t A010138 ContinuedFraction[Sqrt[52],300] (* _Vladimir Joseph Stephan Orlovsky_, Mar 07 2011 *)
%t A010138 PadRight[{7},120,{14,4,1,2,1,4}] (* _Harvey P. Dale_, Nov 22 2018 *)
%o A010138 (PARI) { allocatemem(932245000); default(realprecision, 21000); x=contfrac(sqrt(52)); for (n=0, 20000, write("b010138.txt", n, " ", x[n+1])); } \\ _Harry J. Smith_, Jun 06 2009
%Y A010138 Cf. A010505 Decimal expansion. - _Harry J. Smith_, Jun 06 2009
%K A010138 nonn,cofr
%O A010138 0,1
%A A010138 _N. J. A. Sloane_