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A223599 as a simple table

na(n)
116
248
3256
4144
5256
64096
7432
81504
91376
1065536
111296
126736
1316192
147424
151048576
163888
1732768
18122608
19176224
2040160
2116777216
2211664
23156592
241124064
252372080
261931968
27217600
28268435456
2934992
30755200
319902320
3243725920
3347659632

[16,48,256,144,256,4096,432,1504,1376,65536,1296,
 6736,16192,7424,1048576,3888,32768,122608,176224,
 40160,16777216,11664,156592,1124064,2372080,
 1931968,217600,268435456,34992,755200,9902320,
 43725920,47659632]