2120580

Appears in sequences

• a(n) = (3^n/n!) * Product_{k=0..n-1} (3*k + 5).at n=6A004992
• a(n) = (n+1)*binomial(n+1,4).at n=32A027764
• Triangle read by rows: T(n,k) is the number of subpermutations of an n-set, whose orbits are each of size at most k with at least one orbit of size exactly k, and without fixed points. Equivalently, T(n,k) is the number of partial derangements of an n-set each of whose orbits is of size at most k with at least one orbit of size exactly k, and without fixed points.at n=49A261765
• Product of nonzero remainders n mod p, over all primes p < n.at n=39A383752