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A016788 as a simple table

na(n)
01
116777216
213841287201
31000000000000
423298085122481
5281474976710656
62213314919066161
712855002631049216
859604644775390625
9232218265089212416
10787662783788549761
112386420683693101056
126582952005840035281
1316777216000000000000
1439959630797262576401

[1,16777216,13841287201,1000000000000,
 23298085122481,281474976710656,2213314919066161,
 12855002631049216,59604644775390625,
 232218265089212416,787662783788549761,
 2386420683693101056,6582952005840035281,
 16777216000000000000,39959630797262576401]