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A147272
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
5
11
13
12
25
13
49
14
141
15
407
16
1043
17
2925
18
11783
19
52869
20
254667
21
1211663
[1,1,1,1,1,1,1,1,1,5,13,25,49,141,407,1043,2925, 11783,52869,254667,1211663]