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A146557 as a simple table

na(n)
10
20
36
432
5200
6384
71470
82688
95400
109600
1118150
1227168
1344616
1465856
1590150
16140800
17184960
18274320
19331398
20474400
21569184
22774400
23896126
241366656
251390000
261881984
272204982
282899232
292967048
304545600
314180350
325904384

[0,0,6,32,200,384,1470,2688,5400,9600,18150,27168,
 44616,65856,90150,140800,184960,274320,331398,
 474400,569184,774400,896126,1366656,1390000,
 1881984,2204982,2899232,2967048,4545600,4180350,
 5904384]