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A064626
as a simple table
n
a(n)
1
1
2
2
3
7
4
40
5
355
6
3678
7
37263
8
361058
9
3403613
10
31653377
11
292547199
12
2696619716
[1,2,7,40,355,3678,37263,361058,3403613,31653377, 292547199,2696619716]