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A159939 as a simple table

na(n)
19
2225
3729
418225
565025
6140625
7531441
85267025
911390625
1013286025
1118792225
1240640625
1387890625
141522170225
152197265625
163291890625
173839661225
185430953025
197119140625
208303765625
2111745140625
2225400390625

[9,225,729,18225,65025,140625,531441,5267025,
 11390625,13286025,18792225,40640625,87890625,
 1522170225,2197265625,3291890625,3839661225,
 5430953025,7119140625,8303765625,11745140625,
 25400390625]