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 A007342 M3502 #16 Dec 19 2017 23:01:00 %S A007342 1,4,15,59,209,780 %N A007342 Erroneous version of A001353. %C A007342 Included in accordance with OEIS policy of including published but erroneous sequences to serve as pointers to the correct versions. %D A007342 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence as Entry M3502). %K A007342 dead %O A007342 1,2