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A146402
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
1
10
1
11
1
12
1
13
7
14
7
15
21
16
21
17
51
18
51
19
261
20
261
21
1539
22
1539
23
11759
24
11759
[1,1,1,1,1,1,1,1,1,1,1,1,7,7,21,21,51,51,261,261, 1539,1539,11759,11759]