2381481

Appears in sequences

• a(n) = n! times probability that an ordered pair of elements of S_n chosen at random (with replacement) generate S_n.at n=7A040175
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (0, 0, 1), (0, 1, 0), (1, 0, 0)}.at n=12A151029