71685

Appears in sequences

• Number of rational numbers which can be constructed from the set of integers between 1 and n, through a combination of multiplication and division.at n=15A307105
• Number T(n,k) of partitions of [3n] into n sets of size 3 having exactly k sets {3j-2,3j-1,3j} (1<=j<=n); triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=16A370347