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A093877
as a simple table
n
a(n)
1
1
2
4
3
28
4
234
5
2162
6
21272
7
218740
8
2323730
9
25314097
10
281299736
11
3176220308
12
36332751862
13
420086210688
[1,4,28,234,2162,21272,218740,2323730,25314097, 281299736,3176220308,36332751862,420086210688]