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A155297
as a simple table
n
a(n)
5
1
6
13
7
37
8
148
9
679
10
4360
11
35313
12
311421
13
3782584
14
54217988
15
946558172
[1,13,37,148,679,4360,35313,311421,3782584, 54217988,946558172]