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A109889
as a simple table
n
a(n)
1
1
2
4
3
5
4
6
5
20
6
22
7
25
8
46
9
47
10
214
11
822
12
985
13
3273
14
3590
15
4658
16
4768
17
17250
18
38697
[1,4,5,6,20,22,25,46,47,214,822,985,3273,3590, 4658,4768,17250,38697]