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 A321688 #13 Nov 23 2018 04:09:58 %S A321688 1,2,7,32,171,1110,8148,68500,637688,6592438,74324893,913096970, %T A321688 12092478469,172257496610,2621329989642,42504082679852, %U A321688 730902589691526,13296176824037236,254998358579025213,5144120812828240642,108867706910988952663,2412334062040643706424,55847969248056742007556 %N A321688 Row sums of triangle A321686. %H A321688 Seiichi Manyama, <a href="/A321688/b321688.txt">Table of n, a(n) for n = 1..50</a> %Y A321688 Cf. A000110, A321686. %K A321688 nonn %O A321688 1,2 %A A321688 _Seiichi Manyama_, Nov 17 2018