**E.g.f. satisfies: A(A(x)) = x*exp(A(x)), where A(x) = Sum_{n>=1} a(n)/(n!*2^(n-1)).**

*1, 2, 6, 16, 0, 144, 5488, 47104, 2799360, 29427200, 3293554176, 40830142464*

*3 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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