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A190400 as a simple table

na(n)
10
20
30
4976
518510
6201528
71232448
85637824
920502396
1063720920
11174647286
12434439792
13997037470
142141831160
154348204020
168412482304
1715605151496
1827903377016
1948291880442
2081188237680
21132977239290
22212739639640

[0,0,0,976,18510,201528,1232448,5637824,20502396,
 63720920,174647286,434439792,997037470,2141831160,
 4348204020,8412482304,15605151496,27903377016,
 48291880442,81188237680,132977239290,212739639640]