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A163860
as a simple table
n
a(n)
0
1
1
1
2
3
3
12
4
73
5
580
6
5721
7
69244
8
1000210
9
16319601
10
297453340
[1,1,3,12,73,580,5721,69244,1000210,16319601, 297453340]