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 A254927 #4 Feb 10 2015 15:35:04
%S A254927 1,8,238,15715,1822678,327061056,83839010860,29063729300694,
%T A254927 13090011332041111,7428850394493811712,5185703819680371737432,
%U A254927 4366227375438927437584444,4363140133466727238167744916,5104897162398639619205564019232,6912594322573705179830176812524216
%N A254927 Coefficient of x^n in Product_{k=0..n} (1+k*x)^k.
%H A254927 Vaclav Kotesovec, <a href="/A254927/b254927.txt">Table of n, a(n) for n = 1..200</a>
%F A254927 a(n) ~ exp(n+3/8) * n^(2*n-1/2) / (sqrt(2*Pi) * 3^n).
%t A254927 Table[Coefficient[Expand[Product[(1+k*x)^k,{k,0,n}]],x^n],{n,1,20}] (* or *)
%t A254927 p=1; Table[p=Expand[p*(1+n*x)^n]; Coefficient[p,x^n],{n,1,20}] (* faster *)
%Y A254927 Cf. A129256, A008485, A120295.
%K A254927 nonn
%O A254927 1,2
%A A254927 _Vaclav Kotesovec_, Feb 10 2015