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A013759 as a simple table

na(n)
0256
11048576
24294967296
317592186044416
472057594037927936
5295147905179352825856
61208925819614629174706176
74951760157141521099596496896

[256,1048576,4294967296,17592186044416,
 72057594037927936,295147905179352825856,
 1208925819614629174706176,
 4951760157141521099596496896]