153657

Appears in sequences

• Number of triples of permutations on n letters such that for each j, exactly one of the permutations fixes j and the other two have the same image on j.at n=8A137775
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. exp(-k*x)/(1 - x)^k.at n=74A295181