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 A208631 #17 Jan 28 2019 17:12:23 %S A208631 1,1,3,53,25187,705002611,1672481205752413,475092942773985252468181, %T A208631 22081439406257212482754663652213531, %U A208631 220381419513554767061883905294847700173775763891,599868749018773480515945947095662848011697924400242771204050409 %N A208631 Number of Young tableaux with n n-length rows, increasing entries down the columns and monotonic entries along the rows (first row increasing). %C A208631 Also the number of (n^2-1)-step walks on n-dimensional cubic lattice from (1,0,...,0) to (n,n,...,n) with positive unit steps in all dimensions such that for each point (p_1,p_2,...,p_n) we have p_1<=p_2<=...<=p_n or p_1>=p_2>=...>=p_n. %H A208631 Alois P. Heinz, <a href="/A208631/b208631.txt">Table of n, a(n) for n = 0..12</a> %Y A208631 Main diagonal of A208615. %K A208631 nonn,walk %O A208631 0,3 %A A208631 _Alois P. Heinz_, Feb 29 2012