A190539 - OEIS

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A190539 as a simple table

n	a(n)
0	1
1	2
2	256
3	134217728
4	18446744073709551616
5	42535295865117307932921825928971026432
6	105312291668557186697918027683670432318895095400549111254310977536

[1,2,256,134217728,18446744073709551616, 42535295865117307932921825928971026432, 10531229166855718669791802768367043231889509540054\ 9111254310977536]