racket - Recursive procedure for sum of squares of first n odd numbers? -

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i'm trying implement recursive procedure sum of squares of first n odd numbers on racket (starting 1) e.g., (sum-alt-squares-recursive 0) 0 (sum-alt-squares-recursive 1) 1 (1^2) (sum-alt-squares-recursive 2) 10 (3^2 + 1^2) (sum-alt-squares-recursive 3) 35 (5^2 + 3^2 + 1^2)

this recursive procedure uses linear iterative process

(define (sum-alt-squares-recursive x (y 1) (z 0))   (if (zero? x)       z                                        ; if x zero, return accumulator z       (sum-alt-squares-recursive (- x 1)       ; x goes down 1 each iteration                                  (+ y 2)       ; y starts @ 1 , goes 2 each iteration                                  (+ z (* y y)) ; z, goes y^2 each time       )))  (sum-alt-squares-recursive 1) ; => 1 (sum-alt-squares-recursive 2) ; => 10 (sum-alt-squares-recursive 3) ; => 35

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