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A125068
as a simple table
n
a(n)
8
4
9
14
10
45
11
128
12
368
13
979
14
2601
15
6776
16
17641
17
45690
18
118956
19
309482
20
808323
21
2119187
[4,14,45,128,368,979,2601,6776,17641,45690,118956, 309482,808323,2119187]