$\left [ \left \{ 1,2,3,4 \right \}! \right]^{-1}$Is this the correct notation if one wanted to obtain the factorial for each number in a sequence and then take the sequence and inverse each number in it?
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$\begingroup$I would just write $a_n=\frac 1{n!}$, or if the sequence were defined somewhere else as $b_n$, say $c_n=\frac 1{b_n!}$
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