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A162968 as a simple table

na(n)
21
36
442
5312
62520
722320
8216720
92298240
1026490240
11330220800
124430764800
1363707212800
14977642265600
1515953627289600
16275919291648000
175042392363008000
1897102667870208000
191965528727658496000
2041724269440229376000
21926935665115299840000

[1,6,42,312,2520,22320,216720,2298240,26490240,
 330220800,4430764800,63707212800,977642265600,
 15953627289600,275919291648000,5042392363008000,
 97102667870208000,1965528727658496000,
 41724269440229376000,926935665115299840000]