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A127068 as a simple table

na(n)
01
13
24
3-30
4-216
5420
614400
722680
8-1411200
9-8482320
10195955200
112399997600
12-36883123200
13-788107320000
149066542284800
15318173519664000
16-2824576634880000
17-159078423407904000
181088403529973760000
1997970873094110016000
20-508476519708917760000
21-73631427647097640320000

[1,3,4,-30,-216,420,14400,22680,-1411200,-8482320,
 195955200,2399997600,-36883123200,-788107320000,
 9066542284800,318173519664000,-2824576634880000,
 -159078423407904000,1088403529973760000,
 97970873094110016000,-508476519708917760000,
 -73631427647097640320000]