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A137489 as a simple table

na(n)
112288
220480
328672
445056
553248
669632
777824
894208
9118784
10126976
11151552
12167936
13176128
14192512
15217088
16241664
17249856
18274432
19290816
20299008
21323584
22339968
23364544
24397312
25413696
26421888
27438272
28446464
29462848
30520192
31536576

[12288,20480,28672,45056,53248,69632,77824,94208,
 118784,126976,151552,167936,176128,192512,217088,
 241664,249856,274432,290816,299008,323584,339968,
 364544,397312,413696,421888,438272,446464,462848,
 520192,536576]