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A336296
as a simple table
n
a(n)
1
2
2
3
3
7
4
19
5
71
6
431
7
1259
8
4679
9
9719
10
23399
11
7559
12
42839
13
134399
14
181439
15
477359
16
241919
17
262079
18
453599
[2,3,7,19,71,431,1259,4679,9719,23399,7559,42839, 134399,181439,477359,241919,262079,453599]