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A324576 as a simple table

na(n)
12
23
39
45
515
625
7225
8625
97
1021
1135
12875
1349
14441
151225
161715
172401
1836015
191500625
20117649
212941225
2211
2355
2477
2517325
2667375
27184877
28115548125
29121
303025
315929
32124509
3310168235
34456533
35399466375
3614641
379150625
38717409
3935153041
4015502491081
411127357
421381012325
431771561
4462004635
45208422380089
464774356895
47214358881

[2,3,9,5,15,25,225,625,7,21,35,875,49,441,1225,
 1715,2401,36015,1500625,117649,2941225,11,55,77,
 17325,67375,184877,115548125,121,3025,5929,124509,
 10168235,456533,399466375,14641,9150625,717409,
 35153041,15502491081,1127357,1381012325,1771561,
 62004635,208422380089,4774356895,214358881]