Least m such that A081212(m) = n.

A081214

Least m such that A081212(m) = n.

Terms

    a(0) =1a(1) =4a(2) =12a(3) =84a(4) =3948a(5) =88320a(6) =815424a(7) =14652150a(8) =156281664

External references