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A294384
as a simple table
n
a(n)
0
1
1
3
2
4
3
13
4
61
5
361
6
2521
7
20161
8
181441
9
1814401
10
19958401
11
239500801
12
3353011202
13
50295168017
[1,3,4,13,61,361,2521,20161,181441,1814401, 19958401,239500801,3353011202,50295168017]