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 A350680 #15 Jan 12 2022 21:36:39 %S A350680 1,1,2,11,76,600 %N A350680 Number of hitomezashi loops of width 2n+1 and height 2n+1. %C A350680 The Defant--Kravitz paper proves that every hitomezashi loop has odd width and odd height. %H A350680 Colin Defant and Noah Kravitz, <a href="https://arxiv.org/abs/2201.03461">Loops and regions in hitomezashi patterns</a>, arXiv:2201.03461 [math.CO], 2022. %F A350680 a(n) = A350681(2n,n). %Y A350680 Cf. A121790, A350681. %K A350680 nonn,more %O A350680 0,3 %A A350680 _Colin Defant_, Jan 11 2022