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A203936
as a simple table
n
a(n)
1
406
2
91396
3
32094464
4
14543414270
5
7208336070660
6
3601865763979034
7
1772878084052954152
[406,91396,32094464,14543414270,7208336070660, 3601865763979034,1772878084052954152]