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A178013
as a simple table
n
a(n)
1
1
2
3
3
12
4
108
5
1944
6
38718
7
994392
8
38570364
9
1447995258
10
79481475504
11
7085744965872
[1,3,12,108,1944,38718,994392,38570364,1447995258, 79481475504,7085744965872]