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A198057
as a simple table
n
a(n)
1
1
2
4
3
15
4
75
5
879
6
15766
7
530019
8
30323508
9
2989066962
10
507557052083
[1,4,15,75,879,15766,530019,30323508,2989066962, 507557052083]