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 A174487 #2 Mar 30 2012 18:37:21
%S A174487 1,2,16,308,11048,639972,54671188,6471586298,1014487323984,
%T A174487 203492881479464,50842872702666524,15484223252089602342,
%U A174487 5646860009850046968472,2429577079632942917710580
%N A174487 Column 1 of triangle A174485.
%C A174487 Triangular matrix described by A174485 transforms diagonals of the array A174480 of coefficients of successive iterations of x*exp(x).
%o A174487 (PARI) {a(n,k=1)=local(F=x, xEx=x*exp(x+x*O(x^(n+k+1))), M, N, P, m=n+k); M=matrix(m+2, m+2, r, c, F=x; for(i=1, r+c-2, F=subst(F, x, xEx)); polcoeff(F, c)); N=matrix(m+1, m+1, r, c, M[r, c]); P=matrix(m+1, m+1, r, c, M[r+1, c]); n!*(P~*N~^-1)[n+k+1, k+1]}
%Y A174487 Cf. A174480, A174485, A174486, A174488, A174489.
%K A174487 nonn
%O A174487 0,2
%A A174487 _Paul D. Hanna_, Apr 18 2010