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A305005
as a simple table
n
a(n)
0
1
1
1
2
2
3
9
4
111
5
6829
6
7783192
7
2414627236071
8
56130437209370100252463
[1,1,2,9,111,6829,7783192,2414627236071, 56130437209370100252463]