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A299215
as a simple table
n
a(n)
1
1
2
5
3
22
4
427
5
21730
6
3096833
7
1226106440
8
1213390065190
9
3070232362267950
[1,5,22,427,21730,3096833,1226106440, 1213390065190,3070232362267950]