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A068069
as a simple table
n
a(n)
0
1
1
2
2
5
3
28
4
417
5
14322
6
461890
7
46908264
8
7362724275
9
4418626443462
[1,2,5,28,417,14322,461890,46908264,7362724275, 4418626443462]