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A338814 as a simple table

na(n)
11
20
34
4-6
548
60
71440
8-10080
9120960
100
117257600
12-79833600
13958003200
140
15348713164800
16-3923023104000
1741845579776000
180
1912804747411456000
20-243290200817664000
219731608032706560000
220
232248001455555215360000
24-103408066955539906560000

[1,0,4,-6,48,0,1440,-10080,120960,0,7257600,
 -79833600,958003200,0,348713164800,-3923023104000,
 41845579776000,0,12804747411456000,
 -243290200817664000,9731608032706560000,0,
 2248001455555215360000,-103408066955539906560000]