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A123776
as a simple table
n
a(n)
1
5
2
28
3
185
4
1287
5
9456
6
71167
7
549076
8
4300975
9
34154107
10
273998400
11
2217436152
12
18074303774
13
148232462372
[5,28,185,1287,9456,71167,549076,4300975,34154107, 273998400,2217436152,18074303774,148232462372]