a(n) = (A000040(n)-1) * A002110(n).

A286629

a(n) = (A000040(n)-1) * A002110(n).

Terms

    a(0) =2a(1) =12a(2) =120a(3) =1260a(4) =23100a(5) =360360a(6) =8168160a(7) =174594420a(8) =4908043140a(9) =181151410440

External references