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 A052066 #9 Oct 17 2019 22:16:27 %S A052066 169,10816,1028196,102475129,10210496209,1021021327936, %T A052066 102102415721476,10210210652174569,1021021026820134201, %U A052066 102102102318249314064,10210210230410293217569 %N A052066 Palfree squares whose root is the smallest possible greater than 10^n (palfree = contains no palindromic substring except single digits). %C A052066 Probably finite. %H A052066 Keith Schneider, <a href="/A052066/b052066.txt">Table of n, a(n) for n = 1..25</a> %H A052066 Keith Schneider, <a href="/A052065/a052065.txt">Mathematica code for A052025-A052028</a> %Y A052066 Cf. A052065, A052061, A052062. %K A052066 nonn,base %O A052066 1,1 %A A052066 _Patrick De Geest_, Jan 15 2000 %E A052066 More terms from Keith Schneider (schneidk(AT)email.unc.edu), May 23 2007