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 A055868 #3 Mar 31 2012 13:20:04 %S A055868 0,0,0,0,625,9072,153664,2985984,65610000,1610510000,43717791744, %T A055868 1301153248512,42150011228416,1476840093750000,55662776156160000, %U A055868 2246042996417036288,96619713808095645696,4414553991933897025584 %N A055868 Fifth column of triangle A055864. %F A055868 a(i)=0 for i=1..4; a(n)= n^4*(n+1)^(n-5), n >= 5. %F A055868 E.g.f.: (270*W(-x)^2-740*W(-x)^3+345*W(-x)^4-36*W(-x)^5-270*x^2-1280*x^3-3645*x^4-9216*x^5)/(4320*x), W(x) principal branch of Lambert's function. %Y A055868 a(n)=A055864(n, 5). Cf. A000272, A055865, A055070, A055867, A055858. %K A055868 nonn,easy %O A055868 1,5 %A A055868 _Wolfdieter Lang_ Jun 20 2000