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 A091586 #13 Aug 05 2018 12:06:46 %S A091586 0,1,-1,0,1,0,0,1,-2,0,1,-1,0,1,0,0,1,-1,-1,0,1,-1,0,1,0,0,1,-2,0,1, %T A091586 -1,0,1,0,0,1,-1,0,0,1,-1,0,0,1,0,-1,-1,0,1,-1,0,1,0,0,1,-2,0,1,-1,0, %U A091586 1,0,0,1,-1,-1,0,1,-1,0,1,0,0,1,-2,0,1,-1,0,1,0,0,1,-1,0,0,1,-1,0,0,1,0,-1,0,0,1,-1,-1 %N A091586 First differences of A090822. %H A091586 F. J. van de Bult, D. C. Gijswijt, J. P. Linderman, N. J. A. Sloane and Allan Wilks, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL10/Sloane/sloane55.html">A Slow-Growing Sequence Defined by an Unusual Recurrence</a>, J. Integer Sequences, Vol. 10 (2007), #07.1.2. %H A091586 F. J. van de Bult, D. C. Gijswijt, J. P. Linderman, N. J. A. Sloane and Allan Wilks, A Slow-Growing Sequence Defined by an Unusual Recurrence [<a href="http://neilsloane.com/doc/gijs.pdf">pdf</a>, <a href="http://neilsloane.com/doc/gijs.ps">ps</a>]. %H A091586 <a href="/index/Ge#Gijswijt">Index entries for sequences related to Gijswijt's sequence</a> %K A091586 sign %O A091586 1,9 %A A091586 _N. J. A. Sloane_, Mar 05 2004