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 A296149 #6 Aug 02 2018 07:27:28 %S A296149 2,3,14,32,0,287,438,0,2242,5080,11122,12374,77469 %N A296149 Number of shapes of grid-filling curves of order 4*n+1 (on the square grid) with turns by +-90 degrees that are generated by folding morphisms. %C A296149 Terms are nonzero if and only if 4*n+1 is a term of A057653. %H A296149 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 A296149 Cf. A296148 (number of folding curves of all orders). %Y A296149 Cf. A265685 (simple curves of order 4*n+1). %K A296149 nonn,hard,more %O A296149 1,1 %A A296149 _Joerg Arndt_, Dec 06 2017