209563200

Appears in sequences

• Product of the first n semiprimes.at n=7A112141
• a(n) = C(n+2,2)*(2*n)!/2^n.at n=6A132912
• Triangle read by rows: T(n,k) is the number of rows of n colors with exactly k different colors counting chiral pairs as equivalent, i.e., the rows are reversible.at n=63A305621
• Triangle read by rows: T(n,k) is the number of chiral pairs of rows of n colors with exactly k different colors.at n=63A305622
• Denominators of the fractions f(n) such that (6/Pi^2)*f(n) is the asymptotic density of the numbers k with A280292(k) = sopfr(k) - sopf(k) = n.at n=14A338560