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A330592 as a simple table

na(n)
10
20
32
44
512
624
748
896
9160
10320
11480
12960
131344
142688
153584
167168
179216
1818432
1923040
2046080
2156320
22112640
23135168
24270336
25319488
26638976
27745472
281490944
291720320
303440640
313932160
327864320
338912896
3417825792
3520054016
3640108032
3744826624
3889653248

[0,0,2,4,12,24,48,96,160,320,480,960,1344,2688,
 3584,7168,9216,18432,23040,46080,56320,112640,
 135168,270336,319488,638976,745472,1490944,
 1720320,3440640,3932160,7864320,8912896,17825792,
 20054016,40108032,44826624,89653248]