The term eighteen tube refers to a guitar amp which is available for about six hundred dollars through several different online companies such as Hughes and Kettner.
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If you mean 6, 18, 54 then the 6th term is 1456 because each term is 3 times greater than the previous term
Mean (12, 18, 19, 20, 21) = 18
The sequence has a difference of 10, so the nth term starts with 10n. Then to get to -8 from 10 you need to subtract 18. So the nth term is 10n - 18.
Un = 5n - 2
The 'n'th term is [ 13 + 5n ].