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 A117007 #3 Mar 30 2012 16:50:24 %S A117007 2,-4,2,2,-4,2,-8,10,2,2,-4,-8,2,-4,16,2,4,-20,2,-4,2,6,-4,2,2,14,-8, %T A117007 2,-12,2,-24,16,2,2,14,16,-8,-4,2,-20,-4,-8,16,-12,2,2,16,2,36,-28, %U A117007 -20,-8,14,2,2,-4,-20,2,-4,2,2,12,2,16,-4,36,-8,-4,-36,-24,-14,38,-20,-4,2,2,16,16,2,14,2,-8,4,-20,16,-4,-8,-36,14,2 %N A117007 A117000(8*n-1) - A117001(8*n-1). %D A117007 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 A117007 sign %O A117007 1,1 %A A117007 _N. J. A. Sloane_, Apr 15 2006