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A155390
as a simple table
n
a(n)
7
1
8
7
9
19
10
78
11
382
12
1679
13
8329
14
45625
15
259832
16
1747805
17
14220936
[1,7,19,78,382,1679,8329,45625,259832,1747805, 14220936]