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A058104
as a simple table
n
a(n)
0
1
1
1
2
3
3
15
4
112
5
1221
6
19684
7
1458882
8
3667253972
9
105923135799007
[1,1,3,15,112,1221,19684,1458882,3667253972, 105923135799007]