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 A117883 #11 Jul 19 2021 19:55:04 %S A117883 1,4,6,15,17,19,16,11,9,5 %N A117883 Alternate numbers on a dartboard, read clockwise. %C A117883 These usually appear as beds with white backgrounds with green doubles beds. %Y A117883 Cf. A003833, A008575, A104158, A104159. %K A117883 nonn,fini,full %O A117883 1,2 %A A117883 Danny Williamson (daniel.williamson(AT)durham.ac.uk), May 02 2006