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 A186027 #10 May 16 2020 07:33:18 %S A186027 1,-2,1,-1,-1,-1,1,-1,1,-3,1,-1,-3,1,-1,1,1,-3,1,-1,-1,-5,1,-1,15,-17, %T A186027 -1,1,-17,15,1,-1,-15,13,-3,3,13,-19,3,-3,19,-37,15,-15,-37,-113,15, %U A186027 -15,-113,111,-17,17,-111,-467,-17,17,-467,465,1,-1,-31,1 %N A186027 Numerators of coefficients of x^2 in continued fraction expansion of A106400. %C A186027 Corresponding denominators are A186028. %H A186027 Guo-Niu Han, <a href="https://doi.org/10.1016/j.jnt.2014.07.022">Hankel determinant calculus for the Thue-Morse and related sequences</a>, Journal of Number Theory, Volume 147, February 2015, Pages 374-395. See vn p. 376. %Y A186027 Cf. A186026, A186028. %K A186027 sign %O A186027 0,2 %A A186027 _Paul Barry_, Feb 10 2011 %E A186027 a(0)=1 inserted by _Michel Marcus_, May 16 2020