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A323992 as a simple table

na(n)
113440
2604800
33642240
420818560
544029440
6163900800
7229850880
8677980800
9895238400
101981324800
112184053760
125641829760
135017447680
1410343289600
1511931978240
1621789747840
1719152806400
1840285728000
1933366117120
2068201602560
2162289588480
2298282419200
2386675097600
24183732796800

[13440,604800,3642240,20818560,44029440,163900800,
 229850880,677980800,895238400,1981324800,
 2184053760,5641829760,5017447680,10343289600,
 11931978240,21789747840,19152806400,40285728000,
 33366117120,68201602560,62289588480,98282419200,
 86675097600,183732796800]