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make a dataframe using a simple formula

I want to make a dataframe using a simple formula. the first number I want to be ‘5’ and the next one ‘5 * 2=10′ and the next one ’10 * 2=20’ for 10 times.
out
1 5
2 10
3 20
4 40
5 80
6 160
7 320
8 640
9 1280
10 2560…