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A359690
as a simple table
n
a(n)
1
5
2
13
3
69
4
289
5
1971
6
3997
7
20371
8
45751
9
120957
10
205299
11
629847
12
897801
13
2334409
14
3461459
15
5517131
16
8468061
[5,13,69,289,1971,3997,20371,45751,120957,205299, 629847,897801,2334409,3461459,5517131,8468061]