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 A050636 #6 Mar 05 2015 12:18:54 %S A050636 4,64,1764,6041764,96126041764,8584885596126041764, %T A050636 1094573934406914368584885596126041764, %U A050636 164840278246153785356947805564195221094573934406914368584885596126041764 %N A050636 a(n+1) is next smallest square ending with a(n), initial term is 4. %e A050636 a(6) = 8584885596126041764 = 2929997542^2. %Y A050636 Cf. A050637, A048559, A050630, A061361. %K A050636 nonn,base %O A050636 1,1 %A A050636 _Patrick De Geest_, Jul 15 1999 %E A050636 More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Nov 06 2001