Find
\[\sum_{n = 1}^\infty \frac{n^2 + n - 1}{(n + 2)!}.\]
Question:
Find
\[\sum_{n = 1}^\infty \frac{n^2 + n - 1}{(n + 2)!}.\]
Answer:
Let's think step by step.

user
\frac{1}{2}
Find
\[\sum_{n = 1}^\infty \frac{n^2 + n - 1}{(n + 2)!}.\]
train