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 A319731 #9 Feb 16 2025 08:33:56
%S A319731 1,1,5,20,99,483,2855,16759,112794,777862,5864191,45388575,381557427,
%T A319731 3265488790,29815712658,279926300139,2762328453142,27952237049003,
%U A319731 296275051753578,3212312177119572,36258222471852860,419025393587012853,5010022284030897550
%N A319731 Number of plane partitions of n into parts of sorts {1, 2, ... } which are introduced in ascending order.
%H A319731 Alois P. Heinz, <a href="/A319731/b319731.txt">Table of n, a(n) for n = 0..50</a>
%H A319731 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PlanePartition.html">Plane partition</a>
%H A319731 Wikipedia, <a href="https://en.wikipedia.org/wiki/Plane_partition">Plane partition</a>
%F A319731 a(n) = Sum_{k=0..n} A319730(n,k).
%Y A319731 Row sums of A319730.
%Y A319731 Cf. A258466.
%K A319731 nonn
%O A319731 0,3
%A A319731 _Alois P. Heinz_, Sep 26 2018