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A127067 as a simple table

na(n)
01
12
20
3-24
4-60
5720
65040
7-40320
8-589680
93628800
1099792000
11-479001600
12-23740516800
1387178291200
147682586912000
15-20922789888000
16-3281772285792000
176402373705728000
181801868049805824000
19-2432902008176640000
20-1241948957556827520000
211124000727777607680000

[1,2,0,-24,-60,720,5040,-40320,-589680,3628800,
 99792000,-479001600,-23740516800,87178291200,
 7682586912000,-20922789888000,-3281772285792000,
 6402373705728000,1801868049805824000,
 -2432902008176640000,-1241948957556827520000,
 1124000727777607680000]