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 A152093 #10 Jun 16 2019 15:17:51 %S A152093 1,3,15,101,818,7486,74648,793005,8843056,102464586 %N A152093 Numbers of intervals for the pruning-grafting lattices of size n. %H A152093 J. L. Baril and J. M. Pallo, <a href="https://doi.org/10.1016/j.tcs.2008.08.031">The pruning-grafting lattice of binary trees</a>, Theoretical Computer Science, 409, 2008, 382-393. %K A152093 nonn,more %O A152093 1,2 %A A152093 _Jean-Luc Baril_, Nov 24 2008