That's the way S/KEY works. Each password is a product of successive hashes of the last ones, and you start at the end of the list. That way, an attacker can't derive the next password to be used...
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Re: One Time Passwords/Single Use Passwords Howto
That's the way S/KEY works. Each password is a product of successive hashes of the last ones, and you start at the end of the list. That way, an attacker can't derive the next password to be used...