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 A055070 #4 Mar 31 2012 13:20:01 %S A055070 0,0,9,80,900,12348,200704,3779136,81000000,1948717100,52027785216, %T A055070 1527047909712,48884036690944,1695352148437500,63331869759897600, %U A055070 2535571976423919872,108321063231221415936,4918685157679434648876 %N A055070 Third column of triangle A055864. %F A055070 a(1)=0= a(2); a(n)= n^2*(n+1)^(n-3), n >= 3. %F A055070 E.g.f. (3*W(-x)^2-2*W(-x)^3-3*x^2-8*x^3)/(12*x), W(x) principal branch of Lambert's function. %F A055070 a(n)=A055864(n, 3). %Y A055070 Cf. A055864, A000272, A055865. %K A055070 nonn,easy %O A055070 1,3 %A A055070 _Wolfdieter Lang_ Jun 20 2000