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A155306
as a simple table
n
a(n)
4
1
5
7
6
25
7
55
8
208
9
1168
10
8750
11
74240
12
701683
13
8051955
14
120548805
15
2289918377
16
52736906771
[1,7,25,55,208,1168,8750,74240,701683,8051955, 120548805,2289918377,52736906771]