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A189412 as a simple table

na(n)
10
20
324
4720
56300
634812
7135552
8436944
91198968
102929656
116516984
1213502448
1326208516
1448407988
1585481280
16145200888
17238502808
18380729160
19591761304
20899049096
211336994100
221950873276
232798226336
243952174032
255500597632
267555866072
2710253438688

[0,0,24,720,6300,34812,135552,436944,1198968,
 2929656,6516984,13502448,26208516,48407988,
 85481280,145200888,238502808,380729160,591761304,
 899049096,1336994100,1950873276,2798226336,
 3952174032,5500597632,7555866072,10253438688]