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 A008285 #28 Mar 16 2021 08:31:16 %S A008285 1,1,2,1,12,6,1,86,108,24,1,840,2310,960,120,1,11642,65700,42960,9000, %T A008285 720,1,227892,2583126,2510760,712320,90720,5040,1,6285806,142259628, %U A008285 199424904,71243760,11481120,987840,40320 %N A008285 Erroneous version of A342587. %H A008285 L. Comtet, <a href="https://archive.org/details/Comtet_Louis_-_Advanced_Coatorics/page/n35/mode/2up">Advanced Combinatorics</a>, Reidel, 1974, p. 60. %e A008285 Triangle T(n,k) (with n >= 1 and 1 <= k <= n) begins as follows: %e A008285 1; %e A008285 1, 2; %e A008285 1, 12, 6; %e A008285 1, 86, 108, 24; %e A008285 1, 840, 2310, 960, 120; %e A008285 1, 11642, 65700, 42960, 9000, 720; %e A008285 1, 227892, 2583126, 2510760, 712320, 90720, 5040; %e A008285 ... %Y A008285 Cf. A000142 (diagonal), A001035 (row sums), A055531 (k=2), A055532 (k=3), A055533 (subdiagonal), A081064, A342501 (connected). %K A008285 dead %O A008285 1,3 %A A008285 _N. J. A. Sloane_