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A098635
as a simple table
n
a(n)
0
1
1
1
2
19
3
1111
4
141289
5
32283361
6
11841596779
7
6461678187511
8
4966364015391889
[1,1,19,1111,141289,32283361,11841596779, 6461678187511,4966364015391889]