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A289678
as a simple table
n
a(n)
1
1
2
1
3
3
4
6
5
15
6
42
7
131
8
442
9
1551
10
5723
11
22171
12
89156
13
370199
14
1589240
15
7020127
16
31906974
[1,1,3,6,15,42,131,442,1551,5723,22171,89156, 370199,1589240,7020127,31906974]