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A323040
as a simple table
n
a(n)
1
4
2
20
3
28
4
40
5
88
6
92
7
328
8
1052
9
1420
10
2888
11
3944
12
5888
13
22544
14
154912
15
716668
16
2971600
17
3693728
[4,20,28,40,88,92,328,1052,1420,2888,3944,5888, 22544,154912,716668,2971600,3693728]