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A374342
as a simple table
n
a(n)
0
1
1
1
2
3
3
15
4
259
5
12167
6
1708047
7
157042600
8
33081320935
9
3336975844504
10
579469550006151
[1,1,3,15,259,12167,1708047,157042600,33081320935, 3336975844504,579469550006151]