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A065914
as a simple table
n
a(n)
1
1
2
3
3
8
4
38
5
294
6
2922
7
38949
8
604764
9
11635147
10
287020007
11
7721129740
12
250811981714
[1,3,8,38,294,2922,38949,604764,11635147, 287020007,7721129740,250811981714]