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A093842 as a simple table

na(n)
12
28
324
4264
51320
622440
7157080
82356200
918849600
10339292800
113053635200
12174057206400
132262743683200
1461094079446400
15855317112249600
1625659513367488000
17821104427759616000
1813137670844153856000

[2,8,24,264,1320,22440,157080,2356200,18849600,
 339292800,3053635200,174057206400,2262743683200,
 61094079446400,855317112249600,25659513367488000,
 821104427759616000,13137670844153856000]