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A140299 as a simple table

na(n)
04
116
216
3256
416
5256
616
7256
84096
916
104096
11256
1216
13256
144096
154096
1616
174096
18256
1916
204096
21256
224096
2365536
24256
2516
26256
2716
28256
29268435456
30256
314096
3216
331048576
3416
354096
364096
37256
384096
394096
4016
411048576
4216
43256
4416
4516777216

[4,16,16,256,16,256,16,256,4096,16,4096,256,16,
 256,4096,4096,16,4096,256,16,4096,256,4096,65536,
 256,16,256,16,256,268435456,256,4096,16,1048576,
 16,4096,4096,256,4096,4096,16,1048576,16,256,16,
 16777216]