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A325786
as a simple table
n
a(n)
1
1
2
1
3
2
4
2
5
4
6
7
7
12
8
19
9
41
10
71
11
141
12
255
13
509
14
924
15
1882
16
3395
17
6838
18
12715
19
25233
20
47049
[1,1,2,2,4,7,12,19,41,71,141,255,509,924,1882, 3395,6838,12715,25233,47049]