A simple grammar. a(n)=n*A052873(n-1).

A052857

A simple grammar. a(n)=n*A052873(n-1).

Terms

    a(0) =0a(1) =1a(2) =2a(3) =15a(4) =184a(5) =3145a(6) =68976a(7) =1846999a(8) =58413440a(9) =2130740721a(10) =88061420800

External references