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A100901
as a simple table
n
a(n)
1
1
2
2
3
6
4
7
5
20
6
47
7
255
8
274
9
279
10
308
11
1162
12
2128
13
3791
14
9028
15
9629
16
10029
17
13202
18
38660
19
46631
20
48257
[1,2,6,7,20,47,255,274,279,308,1162,2128,3791, 9028,9629,10029,13202,38660,46631,48257]