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A363207
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
15
6
47
7
170
8
654
9
2699
10
11539
11
50919
12
229529
13
1054374
14
4915265
[1,1,2,6,15,47,170,654,2699,11539,50919,229529, 1054374,4915265]