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 A003223 M1226 #26 Oct 21 2023 17:04:04 %S A003223 1,2,4,10,28,130 %N A003223 Erroneous version of A006841. %D A003223 F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 171. %D A003223 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A003223 V. Meally, <a href="/A003223/a003223.pdf">Letter to N. J. A. Sloane, Feb 1975</a>. %H A003223 E. M. Palmer and R. W. Robinson, <a href="http://dx.doi.org/10.1007/BF02392038">Enumeration under two representations of the wreath product</a>, Acta Math., 131 (1973), 123-143. %Y A003223 Cf. A003224, A003225, A006841 (correct version). %K A003223 dead %O A003223 3,2 %A A003223 _N. J. A. Sloane_