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A353209
as a simple table
n
a(n)
4
18
5
46
6
122
7
326
8
863
9
2252
10
5757
11
14430
12
35531
13
86215
14
206613
15
490247
16
1153733
17
2696961
18
6268921
[18,46,122,326,863,2252,5757,14430,35531,86215, 206613,490247,1153733,2696961,6268921]