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

Terms

a(0) =1a(1) =1a(2) =-2a(3) =1a(4) =19a(5) =-128a(6) =379a(7) =1549a(8) =-32600a(9) =261631a(10) =-845909a(11) =-10713602a(12) =237695149a(13) =-2513395259a(14) =11792378662a(15) =151915180429