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A147169
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
9
6
21
7
55
8
201
9
1193
10
6291
11
45811
12
376085
13
4555905
[1,1,1,1,9,21,55,201,1193,6291,45811,376085, 4555905]
