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3 cards from this section. Quick, good the night before a test.
List the valid sequences for k=1.
Think about what starts and ends.
What is the count of valid sequences for k=2?
Consider the sequence length.
What is the recurrence relation derived for s(k)?
Recall how we reduce the structure.
Is the following statement true? 'For k=2, s(2) = 0.'
What is the only sequence that starts and ends with 1 and 2?
Derive the relation for s(k) for k=5 using the recurrence and initial conditions established.
Start from already known values.
Explore how altering the rules for valid sequences changes the recurrence relation established.
What new rules would you propose?
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