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 A129970 #4 Mar 30 2012 16:50:41 %S A129970 1,4,9,1,121,441,961,4,144,484,9,169,1,10201,40401,90601,121,12321, %T A129970 44521,96721,441,14641,48841,961,4,10404,40804,144,12544,44944,484, %U A129970 14884,9,10609,169,12769,1,1002001,4004001,9006001,10201,1212201,4414201,9616201,40401 %N A129970 a(n) = A129967(n) with digits reversed. %C A129970 Also a(n) = A129969(n)^2. %H A129970 T. D. Noe, <a href="/A129970/b129970.txt">Table of n, a(n) for n=1..5000</a> %K A129970 nonn,base %O A129970 1,2 %A A129970 _N. J. A. Sloane_, Jun 13 2007