A273281 - OEIS

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A273281 as a simple table

n	a(n)
1	1
2	21
3	987
4	1602160116001599
5	350301931135697350301931135696350301931135695350301931135694350301931135693

[1,21,987,1602160116001599, 35030193113569735030193113569635030193113569535030\ 1931135694350301931135693]