369008640

Appears in sequences

• a(1) = 1; a(n)= 2*lcm(n, a(n - 1)).at n=12A191778
• a(0) = 1, a(n) = harmonic_mean(a(n-1), n), where harmonic_mean(p, q) = 2/(1/p + 1/q); numerators.at n=13A353250