A081508 - OEIS

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A081508 as a simple table

n	a(n)
1	3
2	244672067
3	14551915378461487103639747
4	3552713678880267372432493847753987
5	211758236813575107295480170109084902352995775163267

[3,244672067,14551915378461487103639747, 3552713678880267372432493847753987, 21175823681357510729548017010908490235299577516326\ 7]