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 A055862 #4 Mar 31 2012 13:20:04 %S A055862 0,0,0,36,400,5400,86436,1605632,34012224,810000000,21435888100, %T A055862 624333422592,19851622826256,684376513673216,25430282226562500, %U A055862 1013309916158361600,43104723599206637824,1949779138161985486848 %N A055862 Fourth column of triangle A055858. %F A055862 a(i)=0, i=0, 1, 2; a(n)= (n^2)*(n+1)^(n-2), n >= 3. %F A055862 E.g.f.: -x*(1+4*x)/2 + (W(-x)^2)*(1-W(-x))/((1+W(-x))*x*2), W(x) principal branch of Lambert's function. %Y A055862 a(n)=A055858(n, 3). Cf. A000312, A000169, A055860, A055861. %K A055862 nonn,easy %O A055862 0,4 %A A055862 _Wolfdieter Lang_ Jun 20 2000