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A376797
as a simple table
n
a(n)
1
1
2
1
3
4
4
16
5
90
6
562
7
3960
8
29311
9
225370
10
1766974
11
14030739
12
112269684
13
903020688
[1,1,4,16,90,562,3960,29311,225370,1766974, 14030739,112269684,903020688]