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 A058291 #17 Dec 15 2017 17:34:53
%S A058291 6,3,1,1,7,2,146,3,6,1,1,2,7,5,5,1,4,1,2,42,5,31,1,1,1,6,2,2,4,3,12,
%T A058291 49,1,5,1,12,1,1,1,2,3,1,2,1,1,3,1,16,2,1,1,15,2,3,6,3,8,18,6,1,2,1,3,
%U A058291 2,1,2,2,1,1,2,1,8,2,33,1,80,91,1,10,1,5,1,2,2,2,1,49,2,8,2,3,5,4,2,1,1,1
%N A058291 Continued fraction for 2 Pi.
%C A058291 A001203 is the continued fraction for Pi.
%H A058291 Harry J. Smith, <a href="/A058291/b058291.txt">Table of n, a(n) for n = 0..20000</a>
%H A058291 G. Xiao, <a href="http://wims.unice.fr/~wims/en_tool~number~contfrac.en.html">Contfrac</a>
%H A058291 <a href="/index/Con#confC">Index entries for continued fractions for constants</a>
%e A058291 6.283185307179586476925286766... = 6 + 1/(3 + 1/(1 + 1/(1 + 1/(7 + ...)))). - _Harry J. Smith_, May 31 2009
%t A058291 ContinuedFraction[ 2Pi, 100 ]
%o A058291 (PARI) contfrac(2*Pi)
%o A058291 (PARI) { allocatemem(932245000); default(realprecision, 21000); x=contfrac(2*Pi); for (n=0, 20000, write("b058291.txt", n, " ", x[n+1])); } \\ _Harry J. Smith_, May 31 2009
%Y A058291 Cf. A019692 Decimal expansion. - _Harry J. Smith_, May 31 2009
%K A058291 cofr,nonn,easy
%O A058291 0,1
%A A058291 _Robert G. Wilson v_, Dec 07 2000
%E A058291 More terms from _Jason Earls_, Jul 24 2001