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A172436
as a simple table
n
a(n)
1
1
2
15
3
55
4
159
5
411
6
411
7
411
8
3647
9
15243
10
15243
11
15243
12
113343
13
1133759
14
1133759
15
1133759
16
29149139
[1,15,55,159,411,411,411,3647,15243,15243,15243, 113343,1133759,1133759,1133759,29149139]