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A156469
as a simple table
n
a(n)
2
1
3
4
4
54
5
112
6
5414
7
21624
8
2133044
9
23029656
10
5468265896
11
163052061000
12
97305384072800
[1,4,54,112,5414,21624,2133044,23029656, 5468265896,163052061000,97305384072800]