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A069139
as a simple table
n
a(n)
0
2
1
5
2
141
3
68575
4
32089377154
5
1644444237306316731482
6
65593236350142721999718859354569312622907814
[2,5,141,68575,32089377154,1644444237306316731482, 65593236350142721999718859354569312622907814]