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A179712
as a simple table
n
a(n)
5
0
6
20
7
700
8
12390
9
172620
10
2112012
11
23983344
12
260353632
13
2749114368
14
28553296200
15
293791160520
[0,20,700,12390,172620,2112012,23983344,260353632, 2749114368,28553296200,293791160520]