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 A000154 M1798 #16 Oct 23 2017 18:00:48 %S A000154 1,1,2,7,35,228,1834,17382,195866,2487832,35499576,562356672, %T A000154 9794156448,186025364016,3826961710272,84775065603888,2011929826983504 %N A000154 Erroneous version of A003713. %D A000154 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A000154 D. S. Kluk & N. J. A. Sloane, <a href="/A002050/a002050_3.pdf">Correspondence, 1979</a> %K A000154 dead %O A000154 0,3