What is the required recursive function(s) in Scheme programming language to compute the following series?

Question

what is the required recursive function(s) in Scheme programming language to compute the following series?? Explanation needed

1^2/2^1 + 3^4/4^3 + 5^6/6^5 +

Answer 1

//power function
(define (power a b)
     (if (zero? b) //base case
      1    
     (* a (power a (- b 1))))) //or return power of a,b

// sum function for series

    (define (sum n)
     (if (< n 3) //base case 
         0.5
       (+ (/  (power (- n 1) n) (power n (- n 1))) (sum (- n 2 ))  ))) //recursion call

>(sum 10) // call sum function here .