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 A230560 #6 Oct 25 2013 12:24:58 %S A230560 1,2,-1,3,-2,4,-3,5,6,-7,-5,7,-4,8,-9,10,-8,9,-11,12,-10,-6,11,13,-17, %T A230560 14,-13,15,-16,17,-15,16,-12,18,-21,19,-20,21,-19,22,-23,20,-18,23, %U A230560 -24,25,-26,24,-22,26,-28,27,-25,28,29,-42,30,-29,31,-30,32,-33 %N A230560 a(n)*|a(n)| gives the first difference of A230383. %C A230560 This sequence contains only distinct terms, different from 0. %H A230560 Paul Tek, <a href="/A230560/b230560.txt">Table of n, a(n) for n = 1..10000</a> %Y A230560 Cf. A230383, A230565. %K A230560 sign %O A230560 1,2 %A A230560 _Paul Tek_, Oct 23 2013