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A003821
as a simple table
n
a(n)
1
1
2
1
3
2
4
65
5
37709445313
6
44237187584945316063023352626539792098172619389908174093304834
[1,1,2,65,37709445313, 44237187584945316063023352626539792098172619389908\ 174093304834]