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A253912 as a simple table

na(n)
116
238416
3130321
4160000
5923521
61500625
713845841
814776336
916777216
1038950081
11163047361
12181063936
13312900721
14322417936
15384160000
16937890625
171303210000
181600000000
193722098081
207992538801
219235210000
2213841287201
2315006250000
2416610312161
2517748900625
2631414372081
2737141383841

[16,38416,130321,160000,923521,1500625,13845841,
 14776336,16777216,38950081,163047361,181063936,
 312900721,322417936,384160000,937890625,
 1303210000,1600000000,3722098081,7992538801,
 9235210000,13841287201,15006250000,16610312161,
 17748900625,31414372081,37141383841]