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A256982
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
15
6
51
7
190
8
767
9
3256
10
14420
11
65298
12
301920
13
1416398
14
6730574
15
32315128
[1,1,2,6,15,51,190,767,3256,14420,65298,301920, 1416398,6730574,32315128]