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

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =28a(5) =160a(6) =1080a(7) =8470a(8) =76160a(9) =771120a(10) =8671600a(11) =107245600a(12) =1446984000a(13) =21150929800a(14) =332950217600