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A291830 as a simple table

na(n)
14
2512
38748
416641
565536
6312500
71119744
82130048
93294172
104787344
115359225
128388608
1319131876
1436393867
1540000000
1677948684
17143327232
18250994068
19268468225
20272646144
21344882041
22421654016
23612780032
24683437500
25685980800
261073741824
271300078125

[4,512,8748,16641,65536,312500,1119744,2130048,
 3294172,4787344,5359225,8388608,19131876,36393867,
 40000000,77948684,143327232,250994068,268468225,
 272646144,344882041,421654016,612780032,683437500,
 685980800,1073741824,1300078125]