E.g.f. satisfies A(x) = exp(x*A(-x)).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =-8a(4) =21a(5) =336a(6) =-1445a(7) =-35328a(8) =212009a(9) =7010560a(10) =-54073449a(11) =-2258780160a(12) =21303275389