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

A353251

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

Terms

    a(0) =1a(1) =1a(2) =3a(3) =13a(4) =19a(5) =143a(6) =223a(7) =2521a(8) =4201a(9) =21563a(10) =37691a(11) =737161a(12) =1328521a(13) =31463413a(14) =57821173a(15) =21404465a(16) =39854897a(17) =1267947073a(18) =2383173185a(19) =85428430547a(20) =808549483039

External references