%I #7 Sep 08 2013 18:30:35
%S 1,1,1,1,1,2,1,1,2,5,1,1,2,5,15,1,1,2,5,15,52,1,1,2,5,15,52,203
%N Triangle T(n,k) = Bell(k) = A000110(k), 0<=k<=n.
%e First few rows of the triangle are:
%e 1;
%e 1, 1;
%e 1, 1, 2;
%e 1, 1, 2, 5;
%e 1, 1, 2, 5, 15;
%e 1, 1, 2, 5, 15, 52;
%e ...
%Y Cf. A005001 (row sums), A000110.
%K nonn,tabl
%O 0,6
%A _Gary W. Adamson_, Jan 19 2007