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A084284
as a simple table
n
a(n)
1
1
2
1
3
4
4
38
5
727
6
26538
7
1832900
8
241187797
9
60807843592
10
29307734588670
11
26725594885115575
[1,1,4,38,727,26538,1832900,241187797,60807843592, 29307734588670,26725594885115575]