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A112449
as a simple table
n
a(n)
0
1
1
1
2
2
3
10
4
505
5
12878813
6
4229958765311886322
7
5876687051603582015287706866081267480733704277890
[1,1,2,10,505,12878813,4229958765311886322, 5876687051603582015287706866081267480733704277890]