a(0) = 1, a(n) = harmonic_mean(a(n-1), n), where harmonic_mean(p, q) = 2/(1/p + 1/q); numerators.

A353250

a(0) = 1, a(n) = harmonic_mean(a(n-1), n), where harmonic_mean(p, q) = 2/(1/p + 1/q); numerators.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =24a(4) =48a(5) =480a(6) =960a(7) =13440a(8) =26880a(9) =161280a(10) =322560a(11) =7096320a(12) =14192640a(13) =369008640a(14) =738017280a(15) =295206912a(16) =590413824a(17) =20074070016a(18) =40148140032

External references