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A226917
as a simple table
n
a(n)
2
1
3
4
4
9
5
25
6
58
7
142
8
324
9
748
10
1672
11
3736
12
8208
13
17968
14
38944
15
84064
16
180288
17
385216
18
819328
[1,4,9,25,58,142,324,748,1672,3736,8208,17968, 38944,84064,180288,385216,819328]