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 A354406 #7 Jul 18 2022 19:15:28 %S A354406 2,53,1354,43573,1472916,51907977,1877071666 %N A354406 Number of one-sided pseudo-polyarcs with n cells. %C A354406 As A354382, but with mirror-image figures counted as distinct. %Y A354406 Cf. A354382, A057787, A353979. %K A354406 nonn,hard,more %O A354406 1,1 %A A354406 _Aaron N. Siegel_, May 25 2022