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A147163
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
1
7
17
8
21
9
565
10
1121
11
12671
12
31849
13
581567
[1,1,1,1,1,1,17,21,565,1121,12671,31849,581567]
