How to get around restrictions when using recursion in less*?

Question

css

Just tell me if it's possible to get around the recursion restrictions. If so, how?
*On codepen:

@num: 1;
.mixin() when (@num =< 100) {
  #square-@{num} {
    animation-delay: @num;
  }
  @num: @num + 1;
}
  .mixin();

Answer 1

https://codepen.io/paulradzkov/pen/vjEdbM
Instead of recursively defining a variable, we call the mixin recursively:

@num: 100;
.mixin(@num) when (@num > 0) {
  .mixin(@num - 1);
  [email protected]{num} {
    animation-delay: @num;
  }
}
.mixin(@num);