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A206416
as a simple table
n
a(n)
1
4
2
5
3
6
4
8
5
10
6
12
7
14
8
16
9
18
10
20
11
22
12
24
13
24
14
26
15
28
16
29
17
30
18
32
19
33
20
34
21
36
22
37
23
38
24
40
[4,5,6,8,10,12,14,16,18,20,22,24,24,26,28,29,30, 32,33,34,36,37,38,40]