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A016780 as a simple table

na(n)
01
1256
22401
310000
428561
565536
6130321
7234256
8390625
9614656
10923521
111336336
121874161
132560000
143418801
154477456
165764801
177311616
189150625
1911316496
2013845841
2116777216
2220151121
2324010000
2428398241
2533362176
2638950081
2745212176
2852200625
2959969536
3068574961

[1,256,2401,10000,28561,65536,130321,234256,
 390625,614656,923521,1336336,1874161,2560000,
 3418801,4477456,5764801,7311616,9150625,11316496,
 13845841,16777216,20151121,24010000,28398241,
 33362176,38950081,45212176,52200625,59969536,
 68574961]