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A016816 as a simple table

na(n)
01
1625
26561
328561
483521
5194481
6390625
7707281
81185921
91874161
102825761
114100625
125764801
137890481
1410556001
1513845841
1617850625
1722667121
1828398241
1935153041
2043046721
2152200625
2262742241
2374805201
2488529281
25104060401
26121550625
27141158161
28163047361

[1,625,6561,28561,83521,194481,390625,707281,
 1185921,1874161,2825761,4100625,5764801,7890481,
 10556001,13845841,17850625,22667121,28398241,
 35153041,43046721,52200625,62742241,74805201,
 88529281,104060401,121550625,141158161,163047361]