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 A278574 #18 May 04 2021 15:43:37 %S A278574 5,31,8123,45439,156157,480209,2181737,6012899,13626257,60487759, %T A278574 217795247,240485257,995151679,4002927023,7186211917,10514388763, %U A278574 18553663237,34434090797,196122821897 %N A278574 Records in A179210. %Y A278574 Cf. A179210. %K A278574 nonn,more %O A278574 1,1 %A A278574 _Vladimir Shevelev_ and _Robert G. Wilson v_, Oct 20 2016 %E A278574 a(17)-a(19) from _Robert G. Wilson v_, Dec 09 2016