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A145521 as a simple table

na(n)
14
29
38
432
527
625
7128
82048
9243
1049
118192
12125
13131072
142187
15524288
168388608
17536870912
182147483648
19177147
20137438953472
212199023255552
228796093022208
23121
24343
251594323
26140737488355328
279007199254740992
283125
29576460752303423488
302305843009213693952
31147573952589676412928

[4,9,8,32,27,25,128,2048,243,49,8192,125,131072,
 2187,524288,8388608,536870912,2147483648,177147,
 137438953472,2199023255552,8796093022208,121,343,
 1594323,140737488355328,9007199254740992,3125,
 576460752303423488,2305843009213693952,
 147573952589676412928]