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A151828
as a simple table
n
a(n)
2
1
3
2
4
8
5
32
6
139
7
618
8
2779
9
12528
10
56404
11
253152
12
1131849
13
5040412
14
22359981
15
98837102
[1,2,8,32,139,618,2779,12528,56404,253152,1131849, 5040412,22359981,98837102]