524926

Appears in sequences

• Expansion of e.g.f. exp((exp(x)-1)^2/2).at n=10A060311
• Number T(n,k) of set partitions of [n] where each subset is again partitioned into k nonempty subsets; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=57A324162