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A223646 as a simple table

na(n)
19
225
3169
4729
53600
614161
763001
8227529
91002001
104044121
1116273156
1262425801
13265755204
141044840976
154209284641
1616964020516
1767776915600
18271492060401
191096068706489
204316558882689
2117448715791556
2270160140107225

[9,25,169,729,3600,14161,63001,227529,1002001,
 4044121,16273156,62425801,265755204,1044840976,
 4209284641,16964020516,67776915600,271492060401,
 1096068706489,4316558882689,17448715791556,
 70160140107225]