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A321730
as a simple table
n
a(n)
0
1
1
1
2
1
3
3
4
8
5
23
6
79
7
303
8
1294
9
5934
10
29385
11
156232
12
884893
[1,1,1,3,8,23,79,303,1294,5934,29385,156232, 884893]
