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A013734 as a simple table

na(n)
04
1256
216384
31048576
467108864
54294967296
6274877906944
717592186044416
81125899906842624
972057594037927936
104611686018427387904
11295147905179352825856
1218889465931478580854784
131208925819614629174706176

[4,256,16384,1048576,67108864,4294967296,
 274877906944,17592186044416,1125899906842624,
 72057594037927936,4611686018427387904,
 295147905179352825856,18889465931478580854784,
 1208925819614629174706176]