91731

Appears in sequences

• Floor of the expected value of number of trials until exactly five cells are empty in a random distribution of n balls in n cells.at n=30A210116
• a(n) = A239839(n)/n! where A239839(n) is the number of ordered pairs of permutation functions on n elements where f(f(f(x))) = g(f(g(x))).at n=16A255516