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 A274942 #11 Feb 18 2018 20:03:56 %S A274942 1,1,1,2,2,4,6,12,18,41,66,154,265,628,1132,2748,5098,12444 %N A274942 Erroneous version of A129860. %C A274942 Included in accordance with OEIS policy of including published but incorrect sequences to serve as pointers to the correct versions. %D A274942 Joseph Felsenstein, Inferring Phylogenies. Sinauer Associates, Inc., 2004, p. 33. %K A274942 dead %O A274942 3,4