For each of these sequences find a recurrence relation satisfied by this sequence. (The answers are not unique because there are infinitely many different recurrence relations satisfied by any sequence.)
a) an=3.
b) an=2n.
c) an=2n+3.
d) an=5n.
e) an=n2.
f) an=n2+n.
g) an=n+(−1)n.
h)an=n!