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A372892
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
25
6
179
7
2014
8
31178
9
580555
10
12046072
11
267836680
12
6258809085
13
151983244000
[1,1,2,6,25,179,2014,31178,580555,12046072, 267836680,6258809085,151983244000]