A sequence is defined recursively. Write the first five terms.
$a_{1} = - 1; a_{n} = n + a_{n - 1}$

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Final Answer: The first five terms of the sequence are $- 1, 1, 4, 8, 13$

Steps

Step 1 ：The sequence is defined recursively with the first term given as $- 1$ and the nth term defined as the sum of n and the previous term.

Step 2 ：To find the first five terms, we calculate each term based on the previous term.

Step 3 ：Using the given formula, the first five terms of the sequence are calculated as follows: $- 1, 1, 4, 8, 13$

Step 4 ：Final Answer: The first five terms of the sequence are $- 1, 1, 4, 8, 13$