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 A230565 #6 Oct 25 2013 12:25:19 %S A230565 1,2,3,4,5,-7,6,8,-9,10,-11,12,13,-17,14,15,-21,16,18,-24,19,20,-27, %T A230565 22,23,-32,25,26,-36,28,29,-40,30,-31,33,34,-46,35,37,-52,38,39,-54, %U A230565 41,42,-59,43,44,-61,45,47,-65,48,-49,50,51,-70,53,55,-77,56,-57 %N A230565 a(n)*|a(n)| gives the first difference of A230455. %C A230565 This sequence contains only terms with distinct absolute values, different from 0. %H A230565 Paul Tek, <a href="/A230565/b230565.txt">Table of n, a(n) for n = 1..10000</a> %Y A230565 Cf. A230455, A230560. %K A230565 sign %O A230565 1,2 %A A230565 _Paul Tek_, Oct 23 2013