I think (am almost certain) you can be made redundant more than once in ten years. The extra €10K only applies if you haven't been made redundant in the last ten years, but the statutory redundancy plus the basic exemption applies in the case of a genuine redundancy whether you've been made redundant previously or not.
In the case being described by shaneymac this is clearly fraud. Your company would not only forego paying the 10.75% employers PRSI, it would also be entitled to reclaim 60% of the statutory redundancy paid. Given that you've been with the company for five years they would be obliged to pay you a minimum redundancy of eleven weeks wages subject to a maximum of €600 per week. They would be risking an inspection of their records by the dept of enterprise trade and employment, which would confirm exactly how much they paid you, whether or not they replaced you. I don't know what the penalties are for this type of offence, but I would imagine they are quite severe, and I hope the accountant in your office has the good sense to politely decline your request.
Regards,
Past30