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A221599 as a simple table

na(n)
1128
21113
34240
411011
522912
641401
767936
8103975
9150976
10210397
11283696
12372331
13477760
14601441
15744832
16909391
171096576
181307845
191544656
201808467
212100736
222422921
232776480
243162871
253583552
264039981
274533616
285065915
295638336

[128,1113,4240,11011,22912,41401,67936,103975,
 150976,210397,283696,372331,477760,601441,744832,
 909391,1096576,1307845,1544656,1808467,2100736,
 2422921,2776480,3162871,3583552,4039981,4533616,
 5065915,5638336]