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A048392 as a simple table

na(n)
10
21
364
4729
581
6100
76400
81252161
972900
108100
1151251281
1210000
1311881
14134351281
15640000
16125216100
1734327881
187290000
19810000
20811801
2112515120641
225125128100
231000000
241001216164
25100821681
261018081
2710188864
281188100

[0,1,64,729,81,100,6400,1252161,72900,8100,
 51251281,10000,11881,134351281,640000,125216100,
 34327881,7290000,810000,811801,12515120641,
 5125128100,1000000,1001216164,100821681,1018081,
 10188864,1188100]