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A218962
as a simple table
n
a(n)
0
1
1
1
2
1
3
1
4
5
5
21
6
121
7
771
8
5281
9
53065
10
373261
11
3729991
12
38817241
13
484009241
[1,1,1,1,5,21,121,771,5281,53065,373261,3729991, 38817241,484009241]