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A243797
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
10
6
27
7
70
8
206
9
613
10
1942
11
6259
12
20840
13
70528
14
243276
15
850281
[1,1,2,5,10,27,70,206,613,1942,6259,20840,70528, 243276,850281]