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 A283162 #7 Mar 18 2021 18:01:23 %S A283162 1,1,2,4,8,17,44,102,261,635,1632,4045 %N A283162 Number of free polyominoes with n cells containing a complete self-avoiding walk obeying mortal coil rules. %C A283162 A walk obeying mortal coil rules is a walk that can turn only when it can no longer move in the same direction (reached a dead end). %H A283162 Ernest French, <a href="http://fuseki.net/polycover/index.html">Covering Free Polyominos</a> %Y A283162 Cf. A252653. %K A283162 nonn,more %O A283162 1,3 %A A283162 _Dmitry Kamenetsky_, Mar 02 2017