#!/bin/bash
num=1; exx=1
for x in {1..7}; do
echo -en "$x\t$num\t$exx\n"
#echo $num
exx=$((2**num))
#echo $exx
num=$((num*2))

#echo $((2**))
done

#1	1	1
#2	2	2
#3	4	4
#4	8	16
#5	16	256
#6	32	65536
#7	64	4294967296