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 A055867 #9 Jan 28 2017 13:51:52 %S A055867 0,0,0,64,750,10584,175616,3359232,72900000,1771561000,47692136448, %T A055867 1409582685888,45392319784448,1582328671875000,59373627899904000, %U A055867 2386420683693101056,102303226385042448384,4659806991485780193672 %N A055867 Fourth column of triangle A055864. %F A055867 a(i)=0 for i=1, 2, 3; a(n) = n^3*(n+1)^(n-4), n >= 4. %F A055867 E.g.f.: (9*W(-x)^2-14*W(-x)^3+3*W(-x)^4-9*x^2-32*x^3-81*x^4)/(72*x), W(x) principal branch of Lambert's function. %p A055867 A055867:=n->n^3*(n+1)^(n-4): 0,0,0,seq(A055867(n), n=4..30); # _Wesley Ivan Hurt_, Jan 27 2017 %Y A055867 a(n)=A055864(n, 4). Cf. A000272, A055865, A055070, A055866, A055858. %K A055867 nonn,easy %O A055867 1,4 %A A055867 _Wolfdieter Lang_, Jun 20 2000