a(1)=1. a(n) = a(n-1)*(b(n-1)+1), where {b(k)} is the concatenated list of the positive divisors of the terms of {a(k)}.

A129643

a(1)=1. a(n) = a(n-1)*(b(n-1)+1), where {b(k)} is the concatenated list of the positive divisors of the terms of {a(k)}.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =12a(4) =24a(5) =72a(6) =360a(7) =720a(8) =2160a(9) =8640a(10) =43200a(11) =302400a(12) =3931200a(13) =7862400a(14) =23587200a(15) =94348800a(16) =471744000a(17) =3302208000a(18) =29719872000a(19) =386358336000

External references