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A259939 as a simple table

na(n)
01
12
24
36
416
518
664
742
8100
9162
101024
11234
124096
131088
141936
15798
1665536
172300
18262144
194698
2018496
2131744
224194304
238658
24234256
25167936
2652900
2746784
28268435456
2990992
301073741824
3142294
32984064
333866624
345345344
35140300
3668719476736
3717563648
386885376

[1,2,4,6,16,18,64,42,100,162,1024,234,4096,1088,
 1936,798,65536,2300,262144,4698,18496,31744,
 4194304,8658,234256,167936,52900,46784,268435456,
 90992,1073741824,42294,984064,3866624,5345344,
 140300,68719476736,17563648,6885376]