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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =21a(6) =61a(7) =211a(8) =1401a(9) =8065a(10) =37241a(11) =240021a(12) =1997821a(13) =13856701a(14) =94418325a(15) =874328911a(16) =8304303281a(17) =69158458881a(18) =658339599601