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A190659
as a simple table
n
a(n)
1
1
2
1
3
1
4
3
5
3
6
8
7
20
8
53
9
141
10
552
11
2419
12
12788
13
78700
14
561036
15
4750312
[1,1,1,3,3,8,20,53,141,552,2419,12788,78700, 561036,4750312]