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

Terms

a(0) =1a(1) =0a(2) =6a(3) =27a(4) =324a(5) =4050a(6) =64962a(7) =1224720a(8) =26776656a(9) =665390376a(10) =18529576200a(11) =571602980520