Expansion of e.g.f. (1 - x^3/6)^(-x).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =4a(5) =0a(6) =0a(7) =70a(8) =560a(9) =0a(10) =5600a(11) =92400a(12) =369600a(13) =1201200a(14) =30830800a(15) =252252000a(16) =1210809600a(17) =19059040000a(18) =240143904000