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 A109323 #10 Jul 16 2017 07:33:21 %S A109323 2,9,49,423,1333,4425,8763,14089,22825,40291,178705,661285,4543141, %T A109323 20706715,29243521,31089603,32341621,99158905,417976441,1186496401, %U A109323 1540962199,2097064537,8602909969 %N A109323 A109322 with duplicates removed. %Y A109323 Cf. A109322, A109324, A110875. %K A109323 nonn,more %O A109323 1,1 %A A109323 _Max Alekseyev_ and _Jud McCranie_, Aug 08 2005 %E A109323 a(20)-a(23) from _Donovan Johnson_, Jan 25 2012