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 A159899 #2 Mar 30 2012 17:35:35 %S A159899 1,4,2,9,1,3,8,25,4,36,18,1,2,64,6,81,16,4,50,121,1,20,72,9,36,196,2, %T A159899 225,4,11,128,1,12,324,162,13,5,400,8,441,100,3,242,529,1,63,40,17, %U A159899 144,676,18,9,7,19,392,841,4,900,450,12,8,16,22,1089,256,23,2,1225 %N A159899 A variant of A067721 with a different beginning; see A067721 for further information. %Y A159899 Cf. A067721. %K A159899 easy,nonn %O A159899 1,2 %A A159899 _Ctibor O. Zizka_, Apr 25 2009