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A353700 as a simple table

na(n)
21
325
41
5625
625
7138125
85
94225
10625
11801125
1225
131221025
1415625
15105625
1665
17185870425
184225
19185870425
20625
2129641625
2229641625
2330525625
24325
2517850625
2635409725
271221025
2815625
293159797225
30105625
31763140625
321105
331346691125

[1,25,1,625,25,138125,5,4225,625,801125,25,
 1221025,15625,105625,65,185870425,4225,185870425,
 625,29641625,29641625,30525625,325,17850625,
 35409725,1221025,15625,3159797225,105625,
 763140625,1105,1346691125]