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 A006219 M2752 #14 Jul 08 2025 16:43:49 %S A006219 3,8,25,89,357,1602,7959,43127,250591,1537051,9827077 %N A006219 From descending subsequences of permutations. %D A006219 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006219 S. Pilpel, <a href="http://dx.doi.org/10.1016/0097-3165(90)90022-O">Descending subsequences of random permutations</a>, J. Combin. Theory, A 53 (1990), 96-116. %Y A006219 Column 3 of A224652. %K A006219 nonn,more %O A006219 3,1 %A A006219 _N. J. A. Sloane_ %E A006219 a(11)-a(13) from _Sean A. Irvine_, Feb 03 2017