A SEQUENCE OF INTEGERS A1, A2, A3, . . . SATISFIES THE RELATION
2. A sequence of integers a
1
, a
2
, a
3
, . . . satisfies the relation:
4a
n
2
+
1
− 4a
n
a
n
+
1
+ a
2
n
− 1 = 0
for all positive integers n. What are the possible values of a
1
1
2
3
n
2
+
1
n
n
+
1
2
n
1