219528

Appears in sequences

• Expansion of x^5*(1 - x)^2*(4 - 14*x + 8*x^2 + 11*x^3 - 6*x^4 - 2*x^5 + 2*x^6 + 5*x^7 - 2*x^8 + x^9)/(1 - 2*x)^4.at n=18A212330
• Number of compositions (ordered partitions) of n into prime power divisors of n (not including 1).at n=52A284465
• The product of (n!)^2/8 and the variance of the random number of comparisons needed to sort a list of n distinct items using quicksort.at n=6A334935