A073924 - OEIS

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A073924 as a simple table

n	a(n)
1	1
2	2
3	4
4	16
5	128
6	65536
7	9007199254740992
8	73786976294838206464
9	205688069665150755269371147819668813122841983204197482918576128

[1,2,4,16,128,65536,9007199254740992, 73786976294838206464, 20568806966515075526937114781966881312284198320419\ 7482918576128]