13982208

Appears in sequences

• Number of weakly connected oriented graphs on n labeled nodes.at n=5A054941
• Square array A(n,k), n >= 1, k >= 1, read by antidiagonals, where column k is the expansion of e.g.f. log(Sum_{j>=0} k^binomial(j,2) * x^j/j!).at n=33A308460