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A079457
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
20
6
103
7
706
8
7423
9
116476
10
2730992
11
92711668
12
4435835227
[1,1,2,6,20,103,706,7423,116476,2730992,92711668, 4435835227]