Iterating a loop++ without a script in google sheets?

A1: 10
A2: 5

Is it possible to loop through this in google sheets combining count and array formula or will I need to write a ++ script?

I would like the output to be:

B1: 10
B2: 9
B3: 8
B4: 7
B5: 6
B6: 5


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