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 A109324 #10 Jul 16 2017 07:33:16 %S A109324 1,3,5,9,11,15,17,19,23,29,31,35,47,53,55,57,59,67,71,73,81,83,85 %N A109324 Gap lengths associated with A109323. %Y A109324 Cf. A109322, A109323, A110875. %K A109324 nonn,more %O A109324 1,2 %A A109324 _Max Alekseyev_ and _Jud McCranie_, Aug 08 2005 %E A109324 a(19)-a(23) from _Donovan Johnson_, Jan 25 2012