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A284206 as a simple table

na(n)
10
20
30
40
50
60
70
80
9362880
103265920
1133022080
12369774720
134536362880
1460451816320
15869007242880
1613397819541120
17220448163358080
183854801333416320
1971370457471716480
201394586705296776320
2128676809138124407680
22618948032364173877120

[0,0,0,0,0,0,0,0,362880,3265920,33022080,
 369774720,4536362880,60451816320,869007242880,
 13397819541120,220448163358080,3854801333416320,
 71370457471716480,1394586705296776320,
 28676809138124407680,618948032364173877120]