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A013516 as a simple table

na(n)
01
12
28
316
4128
53840
615360
792160
81474560
9185794560
103715891200
11117964800
122831155200
1351011754393600
1413603134504960
158569974738124800
161371195958099968000
1746620662575398912000
18239763407530622976000

[1,2,8,16,128,3840,15360,92160,1474560,185794560,
 3715891200,117964800,2831155200,51011754393600,
 13603134504960,8569974738124800,
 1371195958099968000,46620662575398912000,
 239763407530622976000]