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A291852 as a simple table

na(n)
116
2512
33888
416384
550000
6124416
7268912
8524288
9944784
101185921
111600000
122576816
133981312
145940688
158605184
1612150000
1716777216
1822717712
1930233088
2037949472
2139617584
2251200000
2365345616
2482458112
25102981488
26127401984
27156250000
28190102016
29229582512

[16,512,3888,16384,50000,124416,268912,524288,
 944784,1185921,1600000,2576816,3981312,5940688,
 8605184,12150000,16777216,22717712,30233088,
 37949472,39617584,51200000,65345616,82458112,
 102981488,127401984,156250000,190102016,229582512]