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A197706
as a simple table
n
a(n)
1
1
2
2
3
5
4
12
5
77
6
720
7
9259
8
193296
9
6058254
10
309777781
11
24621646669
12
3052707195554
[1,2,5,12,77,720,9259,193296,6058254,309777781, 24621646669,3052707195554]