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A177607
as a simple table
n
a(n)
0
1
1
1
2
20
3
1680
4
359582
5
156245130
6
120386806922
7
150097348110878
8
283411248751268531
[1,1,20,1680,359582,156245130,120386806922, 150097348110878,283411248751268531]