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A147416
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
3
7
9
8
20
9
53
10
192
11
789
12
4160
13
25089
14
166861
15
1330315
16
12854522
[1,1,1,1,1,3,9,20,53,192,789,4160,25089,166861, 1330315,12854522]