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 A106341 #3 Mar 30 2012 18:36:45
%S A106341 1,-3,9,-45,585,-21105,1858185,-367958745,157169540745,
%T A106341 -141321010837545,263377249955934345,-1006907528155404620745,
%U A106341 7840649068128410073284745,-123736566059916445807102676745,3943516183297402946604761210564745
%N A106341 Column 1 of triangle A106340.
%C A106341 Triangle A106340 is equal to the matrix inverse of the triangle defined by [A106340^-1](n,k) = (n-k)!*A008278(n+1,k+1), for n>=k>=0, where A008278 is a triangle of Stirling numbers of 2nd kind.
%o A106341 (PARI) {a(n)=(matrix(n+2,n+2,r,c,if(r>=c,(r-c)!* sum(m=0,r-c+1,(-1)^(r-c+1-m)*m^r/m!/(r-c+1-m)!)))^-1)[n+2,2]}
%Y A106341 Cf. A106340, A008278.
%K A106341 sign
%O A106341 0,2
%A A106341 _Paul D. Hanna_, May 01 2005