a(0) = 0; for n>0, a(n) = Sum_k={0..n-1} Bell(k), where the Bell numbers Bell(k) are given in A000110.
0, 1, 2, 4, 9, 24, 76, 279, 1156, 5296, 26443, 142418, 820988, 5034585, 32679022
1 seqfan posts
Tue Oct 28 21:27:26 CET 2008 [seqfan] A005002 inconsistent with wikipedia entry about Stirling numbers of the second kind?