Expansion of E.g.f. exp(-x)/(1-3x).

A000180

Expansion of E.g.f. exp(-x)/(1-3x).

Terms

    a(0) =1a(1) =2a(2) =13a(3) =116a(4) =1393a(5) =20894a(6) =376093a(7) =7897952a(8) =189550849a(9) =5117872922a(10) =153536187661

External references