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The first five TERMS of the one sequence, are:
t(1) = 21
t(2) = 16
t(3) = 11
t(4) = 6
t(5) = 1
This looks like the first letters of the days of the weeks.MondayTuesdayWednesdayThursdayFridaySaturdaySunday
Wow you really can't spell.
They correspond to linear sequences.
Assuming the the last part of the question is that the sequence may not END in 000, there are 2997 sequences.
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