ace of 1=9, ace of n=((ace of n)-1)/(n^2); for n is greater than or equal to 2. Write the first four terms of the recursive sequence. (the *

There is a subscript/superscript facility under Format.

Do you mean                                                                                                                                                          

ace₁ = 9

ace_n = ace_n-1/n² ?

If so then ace₂ = ace₁/2² or ace₂ = 9/4

ace₃ = ace₂/3² or ace₃ = (9/4)/9 or ace₃ = 1/4

ace₄ = ace₃/4² or ace₄ = (1/4)/16 or ace₄ = 1/64

 etc.