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A073994 as a simple table

na(n)
10
20
36
448
5300
61800
79072
844928
9252720
101555200
119722592
1260217344
13367960320
142213827200
1513180786560
1678399995904
17468419708160
182810518248960
1916894457846784
20101554796888064
21609923828966400
223659666929459200
2321947538146863104
24131620960833896448

[0,0,6,48,300,1800,9072,44928,252720,1555200,
 9722592,60217344,367960320,2213827200,13180786560,
 78399995904,468419708160,2810518248960,
 16894457846784,101554796888064,609923828966400,
 3659666929459200,21947538146863104,
 131620960833896448]