Expansion of e.g.f.: (1-x)/(1-3*x).

A052563

Expansion of e.g.f.: (1-x)/(1-3*x).

Terms

    a(0) =1a(1) =2a(2) =12a(3) =108a(4) =1296a(5) =19440a(6) =349920a(7) =7348320a(8) =176359680a(9) =4761711360a(10) =142851340800

External references