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 A092473 #16 Oct 31 2021 03:10:57
%S A092473 1,2,18,170,1330,11382,117810,934362,8611746,82240730,699393838,
%T A092473 6244164940,59910383026,507902083210,4599466921410,43063170064620,
%U A092473 372282144948450,3338235118237410,31231394376541650,270058012725600000
%N A092473 a(n) = Sum_{i+j+k=n, 0<=i<=j<=k<=n} (2n)!/((i+j)! * (j+k)! * (k+i)!).
%H A092473 Vaclav Kotesovec, <a href="/A092473/b092473.txt">Table of n, a(n) for n = 0..1000</a> (terms 0..200 from Seiichi Manyama)
%H A092473 Vaclav Kotesovec, <a href="/A092473/a092473.jpg">Plot a(n+1)/a(n) for n = 1..999</a>
%o A092473 (PARI) a(n)=sum(i=0,n,sum(j=0,i,sum(k=0,j,if(i+j+k-n,0,(2*n)!/(i+j)!/(j+k)!/(k+i)!))))
%Y A092473 Cf. A092472.
%K A092473 nonn
%O A092473 0,2
%A A092473 _Benoit Cloitre_, Mar 25 2004