Answer the puzzle: Why are Policemen Strong?

Find the next number in the sequences and exchange it for the letter which corresponds to each sequence with numbers inside the box to decode the answer to the puzzle.

\begin{tabular}{|c|c|}
\hline
A & [tex]$2,5,11,23$[/tex] \\
\hline
B & [tex]$2,4,16$[/tex] \\
\hline
C & [tex]$7,13,19$[/tex] \\
\hline
D & [tex]$19,16,13$[/tex] \\
\hline
E & [tex]$4,8,20,56$[/tex] \\
\hline
F & [tex]$2,2,4,6,10,16$[/tex] \\
\hline
H & [tex]$1,1,2,4,7,13$[/tex] \\
\hline
1 & [tex]$3,6,12,24$[/tex] \\
\hline
, & [tex]$10,11,9,12,8$[/tex] \\
\hline
\end{tabular}

N [tex]$2,6,18,54$[/tex] \\
O [tex]$20,19,17$[/tex] \\
P [tex]$2,3,5,7,9,11,13,15$[/tex] \\
R [tex]$13,26,39$[/tex] \\
S [tex]$5,7,13,31$[/tex] \\
T [tex]$1,1,2,4,7,13,24$[/tex] \\
- [tex]$1,1,1,2,3,4,6,9,13$[/tex] \\
[tex]$5,10$[/tex]