E.g.f.: (3+2*sqrt(3)*exp(x/2)*sin(sqrt(3)*x/2))/(exp(-x)+2*exp(x/2)*cos(sqrt(3)*x/2)).

A178963

E.g.f.: (3+2*sqrt(3)*exp(x/2)*sin(sqrt(3)*x/2))/(exp(-x)+2*exp(x/2)*cos(sqrt(3)*x/2)).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =9a(6) =19a(7) =99a(8) =477a(9) =1513a(10) =11259a(11) =74601a(12) =315523a(13) =3052323a(14) =25740261a(15) =136085041a(16) =1620265923a(17) =16591655817a(18) =105261234643

External references