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A339921
as a simple table
n
a(n)
1
1
2
5
3
7
4
13
5
15
6
18
7
22
8
61
9
85
10
208
11
271
12
898
13
2142
14
2856
15
4392
16
17171
17
74886
18
78901
19
271951
20
326600
[1,5,7,13,15,18,22,61,85,208,271,898,2142,2856, 4392,17171,74886,78901,271951,326600]