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A162508 as a simple table

na(n)
1-1
2-2
32
4-4
510
6-6
7-8
838
9-54
1024
11-16
12130
13-330
14336
15-120
16-32
17422
18-1710
193000
20-2400
21720
22-64
231330
24-8106
2521840
26-29400
2719440
28-5040
29-128
304118
31-36414
32141624
33-285600
34312480
35-176400
3640320

[-1,-2,2,-4,10,-6,-8,38,-54,24,-16,130,-330,336,
 -120,-32,422,-1710,3000,-2400,720,-64,1330,-8106,
 21840,-29400,19440,-5040,-128,4118,-36414,141624,
 -285600,312480,-176400,40320]