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#
##
12nn
##
m
- n=1m=1
- n=2m=2
n
- case11fn-1
- case22fn-2
- ...
- case n:n0
n`f(n)=f(1)+f(2)+f(3)+..+f(n-1)+1`f(n)`n-1``f`
```
f(1)=1
f(2)=2
f(3)=f(2)+f(1)+1
f(4)=f(3)+f(2)+f(1)+1
f(5)=f(4)+f(3)+f(2)+f(1)+1
=f(4)+f(4)
f(6)=f(5)+f(4)+f(3)+f(2)+f(1)+1
=f(5)+f(5)
```
` f(n)=2*f(n-1)`
##
[](../Code/8.py)
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