a(n) is the least number k such that A348264(k) = n, or -1 if no such number exists.

A348265

a(n) is the least number k such that A348264(k) = n, or -1 if no such number exists.

Terms

    a(0) =1a(1) =2a(2) =84a(3) =1596a(4) =410652a(5) =9114300a(6) =10628100a(7) =3012406320

External references