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A066648 as a simple table

na(n)
1512
21000
32744
421952
532768
635937
764000
8175616
9185193
10274625
11357911
12373248
13405224
14474552
15729000
161157625
171404928
181481544
192000376
202097152
212197000
222299968
232744000
243241792
253652264
263723875
274096000
285451776

[512,1000,2744,21952,32768,35937,64000,175616,
 185193,274625,357911,373248,405224,474552,729000,
 1157625,1404928,1481544,2000376,2097152,2197000,
 2299968,2744000,3241792,3652264,3723875,4096000,
 5451776]