The questions read as follows:

Find all solutions of the recurrence relation

a -subscript-n = n+2-2a-subscript-n-1, a-subscript 1 = 0

My instructor says it is similar to:

Let R be the relation R-{(a,b) | a divides b} on the set of positive integers. Find

A) r^-1

B)R^-

and

Which of the relations from Example 7 are symmetric and which are antisymmetric?

Do these indeed relate? I've read the entire chapter and haven't seen one problem setup like the one asked.