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A125069
as a simple table
n
a(n)
8
6
9
19
10
59
11
184
12
495
13
1259
14
3105
15
7684
16
19251
17
48561
18
123800
19
317883
20
822980
21
2144429
[6,19,59,184,495,1259,3105,7684,19251,48561, 123800,317883,822980,2144429]