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A123866 as a simple table

na(n)
10
263
3728
44095
515624
646655
7117648
8262143
9531440
10999999
111771560
122985983
134826808
147529535
1511390624
1616777215
1724137568
1834012223
1947045880
2063999999
2185766120
22113379903
23148035888
24191102975
25244140624
26308915775
27387420488

[0,63,728,4095,15624,46655,117648,262143,531440,
 999999,1771560,2985983,4826808,7529535,11390624,
 16777215,24137568,34012223,47045880,63999999,
 85766120,113379903,148035888,191102975,244140624,
 308915775,387420488]