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 A003175 M1847 #22 Jun 16 2017 02:35:14 %S A003175 1,2,8,31,139,724 %N A003175 Almost certainly an erroneous version of A129427. %D A003175 P. A. Morris, Letter to N. J. A. Sloane, Mar 02 1971. %D A003175 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A003175 P. A. Morris, <a href="/A003175/a003175.pdf">Letter to N. J. A. Sloane, Mar 02 1971</a>. %Y A003175 Cf. A129427, A005638. %K A003175 dead %O A003175 0,2 %A A003175 _N. J. A. Sloane_, Jul 02 2015