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 A165488 #7 Jan 26 2013 17:53:33 %S A165488 0,1,4,9,16,9,16,9,16,25,16,9,16,9,4,1,4,1,4,9,4,1,0,-1,0,1,0,1,0,1,0, %T A165488 -1,0,-1,-4,-1,0,-1,0,-1,-4,-1,-4,-9,-16,-25,-36,-25,-16,-9,-4,-9,-16, %U A165488 -9,-4,-1,-4,-1,0,-1,-4,-1,-4,-9,-4,-1,-4,-9,-16,-25,-16,-25,-16,-9 %N A165488 Square the terms of A165482 while preserving the signs. %C A165488 Period 28657. %H A165488 A. Karttunen, <a href="/A165488/b165488.txt">Table of n, a(n) for n = 0..28657</a> %Y A165488 Cf. A165486, A165487, A165488. %K A165488 sign %O A165488 0,3 %A A165488 _Antti Karttunen_, Sep 21 2009 %E A165488 Definition revised by _N. J. A. Sloane_, Jan 26 2013