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 A354701 #9 Jun 09 2022 11:34:11 %S A354701 0,0,5,21,71,181,366,585,1009,1562,2312,3206,4490,5967,7939,10023, %T A354701 12913,15900,19951,24153,29483,35227,42039,49103,57998,67518,78426, %U A354701 90010,103631,117759,134551,150970,171440,192305,215740,239549,268137,296993,329001,361740,400113 %N A354701 Diagonal of the triangle A354700. %H A354701 Hugo Pfoertner, <a href="/A354701/b354701.txt">Table of n, a(n) for n = 1..76</a> %F A354701 a(n) = A354700(n, n). %e A354701 See A354700. %Y A354701 Cf. A353447, A353532. %K A354701 nonn %O A354701 1,3 %A A354701 _Hugo Pfoertner_, Jun 07 2022