How to create a RACSequence from a method that returns an array

Given a method that returns an array of objects, how could you create a sequence that would be populated only with the results of this method when using it?

- (NSArray *) methodA { ... }

- (RACSequence *) methodB {
  return [self methodA].rac_sequence;
}

I am wondering if it is possible to avoid the execution of method A, unless this sequence is used, but still returns the sequence from method B, in order to pass it, I decided to use it.

Update

I managed to achieve the desired behavior using a signal instead of a sequence.

- (RACSignal *)methodB {
    RACSignal *racSignal = [RACSignal defer:^RACSignal * {
        return [self methodA].rac_sequence.signal;
    }];

    return racSignal;
}

Now method A is called only when subscribing to a signal. Why is there no similar concept for delaying sequences?