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A080627
as a simple table
n
a(n)
0
1
1
6
2
27
3
120
4
519
5
1932
6
6484
7
20310
8
55034
9
113892
10
178495
11
179196
12
89728
13
16176
14
1488
15
144
[1,6,27,120,519,1932,6484,20310,55034,113892, 178495,179196,89728,16176,1488,144]