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A147019
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
13
6
57
7
277
8
2427
9
27961
10
440433
11
11044775
12
365499077
13
16910160525
14
1114224590577
[1,1,1,1,13,57,277,2427,27961,440433,11044775, 365499077,16910160525,1114224590577]