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A005306
as a simple table
n
a(n)
3
2
4
4
5
10
6
22
7
40
8
76
9
138
10
238
11
408
12
682
13
1112
14
1792
15
2844
16
4444
17
6872
18
10510
19
15896
20
23834
[2,4,10,22,40,76,138,238,408,682,1112,1792,2844, 4444,6872,10510,15896,23834]