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A005305
as a simple table
n
a(n)
2
2
3
4
4
8
5
16
6
30
7
56
8
100
9
172
10
290
11
480
12
780
13
1248
14
1970
15
3068
16
4724
17
7200
18
10862
19
16240
20
24080
[2,4,8,16,30,56,100,172,290,480,780,1248,1970, 3068,4724,7200,10862,16240,24080]