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 A117008 #3 Mar 30 2012 16:50:24 %S A117008 1,-2,1,1,-2,1,-4,5,1,1,-2,-4,1,-2,8,1,2,-10,1,-2,1,3,-2,1,1,7,-4,1, %T A117008 -6,1,-12,8,1,1,7,8,-4,-2,1,-10,-2,-4,8,-6,1,1,8,1,18,-14,-10,-4,7,1, %U A117008 1,-2,-10,1,-2,1,1,6,1,8,-2,18,-4,-2,-18,-12,-7,19,-10,-2,1,1,8,8,1,7,1,-4,2,-10,8,-2,-4,-18,7,1,1,-6,1,1,10,-12,21 %N A117008 (A117000(8*n-1) - A117001(8*n-1))/2. %D A117008 H. J. S. Smith, Report on the Theory of Numbers, reprinted in Vol. 1 of his Collected Math. Papers, Chelsea, NY, 1979, see p. 322. %K A117008 sign %O A117008 1,2 %A A117008 _N. J. A. Sloane_, Apr 15 2006