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A047928 as a simple table

na(n)
20
312
472
5240
6600
71260
82352
94032
106480
119900
1214520
1320592
1428392
1538220
1650400
1765280
1883232
19104652
20129960
21159600
22194040
23233772
24279312
25331200
26390000
27456300
28530712
29613872
30706440
31809100
32922560
331047552
341184832

[0,12,72,240,600,1260,2352,4032,6480,9900,14520,
 20592,28392,38220,50400,65280,83232,104652,129960,
 159600,194040,233772,279312,331200,390000,456300,
 530712,613872,706440,809100,922560,1047552,
 1184832]