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A147261
as a simple table
n
a(n)
1
1
2
1
3
1
4
9
5
33
6
105
7
825
8
13503
9
390699
10
9339771
11
391769047
12
28305812373
13
3390227207577
[1,1,1,9,33,105,825,13503,390699,9339771, 391769047,28305812373,3390227207577]