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A146568 as a simple table

na(n)
24
320
420
572
6224
772
8232
91672
101672
11232
12716
1310528
1423528
1510528
16716
172172
1860636
19259688
20259688
2160636
222172
236544
24331584
252485232
264674944
272485232
28331584
296544
3019664
311756304
3221707888
3369413168
3469413168
3521707888
361756304

[4,20,20,72,224,72,232,1672,1672,232,716,10528,
 23528,10528,716,2172,60636,259688,259688,60636,
 2172,6544,331584,2485232,4674944,2485232,331584,
 6544,19664,1756304,21707888,69413168,69413168,
 21707888,1756304]