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A147491 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 25
12 25
13 137
14 137
15 521
16 521
17 6501
18 6501
19 70441
20 70441
21 694381
22 694381
23 20946853
24 20946853
25 656540805

[1,1,1,1,1,1,1,1,1,1,25,25,137,137,521,521,6501,
 6501,70441,70441,694381,694381,20946853,20946853,
 656540805]

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Last modified September 28 06:57 EDT 2021. Contains 347703 sequences. (Running on oeis4.)