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A048657 as a simple table

na(n)
10
20
30
44
58
622
744
880
9144
10254
11508
12760
131520
142528
153968
165312
1710624
1814560
1929120
2040784
2160544
2295744
23191488
24242368
25339520
26531712
27676864
28916768
291833536
302331776
314663552
325527552
337862272
3412163072
3516420864
3619593472

[0,0,0,4,8,22,44,80,144,254,508,760,1520,2528,
 3968,5312,10624,14560,29120,40784,60544,95744,
 191488,242368,339520,531712,676864,916768,1833536,
 2331776,4663552,5527552,7862272,12163072,16420864,
 19593472]