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A146705
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
21
7
47
8
269
9
1463
10
8149
11
63091
12
761263
13
8894963
14
159626291
15
3010312887
16
80637272407
[1,1,1,1,1,21,47,269,1463,8149,63091,761263, 8894963,159626291,3010312887,80637272407]