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 A058719 #11 Sep 03 2023 10:29:07 %S A058719 1,3,9,25,70,217,950,8762,288454 %N A058719 Number of nonisomorphic loopless matroids of rank 3 on n labeled points. %D A058719 A. Evnin, An Elementary Introduction to Matroids, Mathematical Education, 2(33), 2005, 2-33. %H A058719 W. M. B. Dukes, <a href="http://www.stp.dias.ie/~dukes/matroid.html">Tables of matroids</a> %H A058719 W. M. B. Dukes, <a href="http://www.stp.dias.ie/~dukes/phd.html">Counting and Probability in Matroid Theory</a>, Ph.D. Thesis, Trinity College, Dublin, 2000. %H A058719 A. Evnin, <a href="http://www.mathnet.ru/eng/mo412">An elementary Introduction to Matroids</a>, Mathematical Education 2 (33) (2005), 2-33 %H A058719 <a href="/index/Mat#matroid">Index entries for sequences related to matroids</a> %Y A058719 A diagonal of A058716. %K A058719 nonn %O A058719 3,2 %A A058719 _N. J. A. Sloane_, Dec 31 2000 %E A058719 a(9)-a(11) _Alexander Evnin_, Dec 26 2008