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A350216
as a simple table
n
a(n)
1
7
2
19
3
1
4
173
5
1547
6
559667
7
347707
8
36695077
9
139760989
10
7931271479
[7,19,1,173,1547,559667,347707,36695077,139760989, 7931271479]