Erroneous version of A009287 (the 2 should be omitted).

A036460

Erroneous version of A009287 (the 2 should be omitted).

Terms

    a(0) =2a(1) =3a(2) =4a(3) =6a(4) =12a(5) =60a(6) =5040a(7) =293318625600

External references