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A056284 as a simple table

na(n)
10
20
30
46
548
6260
71200
85106
920720
1081876
11318000
121223136
134675440
1417815020
1567769552
16257700906
17980240880
183731753180
1914222737200
2054278580036
21207438938000
22793940475900
233043140078000
2411681057249536
2544900438149296
26172824331826580
27666070256489680

[0,0,0,6,48,260,1200,5106,20720,81876,318000,
 1223136,4675440,17815020,67769552,257700906,
 980240880,3731753180,14222737200,54278580036,
 207438938000,793940475900,3043140078000,
 11681057249536,44900438149296,172824331826580,
 666070256489680]