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 A055863 #3 Mar 31 2012 13:20:04 %S A055863 0,0,0,0,320,4500,74088,1404928,30233088,729000000,19487171000, %T A055863 572305637376,18324574916544,635492476982272,23734930078125000, %U A055863 949978046398464000,40569151622782717952,1841458074930764070912 %N A055863 Fifth column of triangle A055858. %F A055863 a(i)=0, i=0..3; a(n)= (n^3)*(n+1)^(n-3), n >= 4. %F A055863 E.g.f.: -x*(3+16*x+54*x^2)/12+(W(-x)^2)*(3-7*W(-x)+2*W(-x)^2)/ (12*(1+W(-x))*x), W(x) principal branch of Lambert's function. %Y A055863 a(n)=A055858(n, 4). Cf. A000312, A000169, A055860-A055862. %K A055863 nonn,easy %O A055863 0,5 %A A055863 _Wolfdieter Lang_ Jun 20 2000