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A063981 as a simple table

na(n)
12
24
39
416
581
685
7256
8931
965536
104599097
116309263
1216905401
1343046721
1454116239
1568229263
1698643563
17208288271
18222933913
19226461649
20230893123
21280399957
22381001633
23412016873
24417814973
25485674237
26620336281
27736284077

[2,4,9,16,81,85,256,931,65536,4599097,6309263,
 16905401,43046721,54116239,68229263,98643563,
 208288271,222933913,226461649,230893123,280399957,
 381001633,412016873,417814973,485674237,620336281,
 736284077]