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 A018848 #19 Aug 08 2014 09:19:14 %S A018848 0,1,6889,69169,109181601 %N A018848 Strobogrammatic squares: the same upside down (probably finite). %C A018848 Square numbers which when written down and rotated by 180 degrees are unchanged. %C A018848 Subsequence of squares in A000787. - _Derek Orr_ and _Michel Marcus_, Aug 04 2014 %Y A018848 Cf. A000787, A018849 (similar sequence). %K A018848 nonn,base %O A018848 1,3 %A A018848 _David W. Wilson_