Expansion of e.g.f. exp(x^3/(6 * (1 - x)^2)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =8a(5) =60a(6) =490a(7) =4480a(8) =45920a(9) =524440a(10) =6619200a(11) =91568400a(12) =1377884200a(13) =22401579200a(14) =391192401600