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A234012
as a simple table
n
a(n)
1
1
2
4
3
24
4
230
5
2601
6
32810
7
433855
8
5923677
9
82675193
10
1173878266
[1,4,24,230,2601,32810,433855,5923677,82675193, 1173878266]