An integer sequence a_{1}, a_{2}, \ldots, a_{n} has a_{1}=0, a_{n} \leq 10 and a_{i+1}-a_{i} \geq 2 for 1 \leq i<n. How many possibilities are there for this sequence? The sequence may be of any length.
An integer sequence a_{1}, a_{2}, \ldots, a_{n} has a_{1}=0, a_{n} \leq 10 and a_{i+1}-a_{i} \geq 2 for 1 \leq i<n. How many possibilities are there for this sequence? The sequence may be of any length.