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A177093
as a simple table
n
a(n)
1
2
2
4
3
7
4
10
5
11
6
31
7
127
8
136
9
215
10
953
11
1139
12
1799
13
3406
14
7633
15
13090
16
13171
17
13511
18
32593
[2,4,7,10,11,31,127,136,215,953,1139,1799,3406, 7633,13090,13171,13511,32593]