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A056289 as a simple table

na(n)
10
20
30
46
548
6260
71200
85100
920720
1081828
11318000
121222870
134675440
1417813820
1567769504
16257695800
17980240880
183731732200
1914222737200
2054278498154
21207438936800
22793940157900
233043140078000
2411681056021300
2544900438149248
26172824327151140
27666070256468960

[0,0,0,6,48,260,1200,5100,20720,81828,318000,
 1222870,4675440,17813820,67769504,257695800,
 980240880,3731732200,14222737200,54278498154,
 207438936800,793940157900,3043140078000,
 11681056021300,44900438149248,172824327151140,
 666070256468960]