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A085864 as a simple table

na(n)
12
24
312
472
5864
620736
7933120
8117573120
942326323200
1036315985305600
11146426052752179200
121475974611741966336000
1337784950060594338201600000
142031318915257551621718016000000
15212719716805770805826310635520000000

[2,4,12,72,864,20736,933120,117573120,42326323200,
 36315985305600,146426052752179200,
 1475974611741966336000,37784950060594338201600000,
 2031318915257551621718016000000,
 212719716805770805826310635520000000]