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A242790
as a simple table
n
a(n)
1
1
2
1
3
2
4
4
5
11
6
39
7
165
8
967
9
7684
10
87012
11
1410465
12
32640019
[1,1,2,4,11,39,165,967,7684,87012,1410465, 32640019]