Recursive sequence nth term (ACT). Game on.

A sequence is defined by $a_1 = 5$ and $a_n = a_{n-1} + (n-1)$ for $n \geq 2$. The first five terms are $5, 6, 8, 11, 15$. What is $a_7$?

A sequence is defined by $a_1 = 3$ and $a_n = 2a_{n-1}$ for $n \geq 2$. The first four terms are $3, 6, 12, 24$. What is $a_6$?

A sequence is defined by $a_1 = 20$ and $a_n = a_{n-1} - 3$ for $n \geq 2$. The first four terms are $20, 17, 14, 11$. What is $a_6$?

A sequence is defined by $a_1 = 7$ and $a_n = a_{n-1} + 3$ for $n \geq 2$. The first five terms are $7, 10, 13, 16, 19$. What is $a_6$?

A sequence is defined by $a_1 = 4$ and $a_n = a_{n-1} + 2(n-1)$ for $n \geq 2$. The first five terms are $4, 6, 10, 16, 24$. What is $a_6$?

A sequence is defined by $a_1 = 30$ and $a_n = a_{n-1} - (n-1)$ for $n \geq 2$. The first four terms are $30, 29, 27, 24$. What is $a_7$?

A sequence is defined by $a_1 = 1$ and $a_n = a_{n-1} + n(n-1)$ for $n \geq 2$. The first five terms are $1, 3, 9, 21, 41$. What is $a_7$?

A sequence is defined by $a_1 = 2$ and $a_n = 2a_{n-1} - 1$ for $n \geq 2$. The first four terms are $2, 3, 5, 9$. What is $a_7$?