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 A016509 #13 Dec 24 2015 23:30:11
%S A016509 4,2,1,1,6,1,1,1,1,5,1,17,1,7,2,1,2,4,4,3,1,7,1,1,4,2,1,8,2,2,5,2,1,2,
%T A016509 1,5,1,11,5,1,3,55,1,1,1,1,9,613,1,3,2,1,1,3,1,1,1,1,2,3,1,18,1,10,1,
%U A016509 2,1,23,5,2,4,1,1,4,1,2,1,2
%N A016509 Continued fraction for log(81).
%H A016509 Harry J. Smith, <a href="/A016509/b016509.txt">Table of n, a(n) for n = 1..20000</a>
%e A016509 4.394449154672438765580980947... = 4 + 1/(2 + 1/(1 + 1/(1 + 1/(6 + ...)))). - _Harry J. Smith_, May 24 2009
%t A016509 ContinuedFraction[Log[81],100] (* _Harvey P. Dale_, Oct 05 2012 *)
%o A016509 (PARI) { allocatemem(932245000); default(realprecision, 21000); x=contfrac(log(81)); for (n=1, 20000, write("b016509.txt", n, " ", x[n])); } \\ _Harry J. Smith_, May 24 2009
%Y A016509 Cf. A016704 Decimal expansion. - _Harry J. Smith_, May 24 2009
%K A016509 nonn,cofr
%O A016509 1,1
%A A016509 _N. J. A. Sloane_