Write the sum of `n` term for a series whose `r^(t h)` term is: `r+2^r.`

Explanation

Let the series whose r^th term is `r+2^r.`as

`(1+2^1)+(2+2^2)+(3+2^3)+(4+2^4)+........(n+2^n)`

Therefore we have

`S_n=(1+2^1)+(2+2^2)+(3+2^3)+(4+2^4)+........(n+2^n)`

`S_n=(1+2+3+4+.......+n)+(2+2^2+2^3+2^4+........+2^n)`

`S_n=((n(n+1))/2)+2((2^n-1)/(2-1))`

`S_n=((n(n+1))/2)+2^(n+1)-2`

Hence, the sum of `n`
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