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A135719
as a simple table
n
a(n)
3
1
4
11
5
40
6
403
7
1224
8
4886
9
19096
10
120137
11
485941
12
2974628
13
25293838
[1,11,40,403,1224,4886,19096,120137,485941, 2974628,25293838]