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A174283
as a simple table
n
a(n)
1
1
2
2
3
4
4
9
5
23
6
57
7
151
8
415
9
1157
10
3191
11
8687
12
23199
13
61677
14
163257
15
432541
16
1146671
17
3039829
[1,2,4,9,23,57,151,415,1157,3191,8687,23199,61677, 163257,432541,1146671,3039829]