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A155307
as a simple table
n
a(n)
4
1
5
4
6
13
7
37
8
146
9
620
10
2737
11
17298
12
136979
13
1185666
14
12752003
15
161758550
16
2364549128
17
42702118766
[1,4,13,37,146,620,2737,17298,136979,1185666, 12752003,161758550,2364549128,42702118766]