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 A296148 #10 Oct 18 2019 11:50:25 %S A296148 1,1,1,0,2,2,0,0,6,3,20,0,0,14,0,0,44,32,69,0,212,0,0,0,0,287,796,0,0, %T A296148 438,0,0,1402,0,4232,0,3202,2242,0,0,14316,5080,0,0,0,11122,0,0,0, %U A296148 12374,155305,0,152602,77469 %N A296148 Number of shapes of grid-filling curves of order n (on the square grid) with turns by +-90 degrees that are generated by folding morphisms. %C A296148 a(0)=1 and a(1)=1 correspond to the trivial (empty and single-stroke) curves of orders 0 and 1 respectively. %C A296148 a(2) = 1 corresponds to the Heighway-Harter dragon (also known as paperfolding dragon). %H A296148 Jörg Arndt, Julia Handl, <a href="http://archive.bridgesmathart.org/2018/bridges2018-179.html">Plane-filling Folding Curves on the Square Grid</a>, Proceedings of Bridges 2018: Mathematics, Art, Music, Architecture, Education, Culture; Stockholm (2018). %Y A296148 Cf. A296147 (nonzero terms of this sequence). %K A296148 nonn,hard,more %O A296148 0,5 %A A296148 _Joerg Arndt_ and Julia Handl, Dec 06 2017