Pair of recurrences for coefficients of the exponential reverse – mathoverflow.net
Mikhail Kurkov
Let
$a(n)$ be an arbitrary sequence with exponential generating function $A(x)$ such that $a(1)=1$.
$\alpha(x)$ denotes $\operatorname{SeriesReversion}(A(x))$.
$b(n)$ be a sequence with exponential ...