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GeneratingFunction
SpecialSequence
Difficult
Problem - 4511
Solve the recursion
a
n
=
n
−
1
∑
k
=
0
a
k
a
n
−
k
−
1
=
a
0
a
n
−
1
+
a
1
a
n
−
2
+
⋯
+
a
n
−
1
a
0
where
a
0
=
a
1
=
1
.
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