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A249785 as a simple table

na(n)
01
11
2-1
34
4-19
5160
6-1405
717920
8-231175
93942400
10-67260025
111435033600
12-30485899675
13780658278400
14-19861319603125
15593300291584000
16-17590824363487375
17600419895083008000
18-20332162643728560625
19780545863607910400000
20-29725015420426543091875
211267606482499246489600000

[1,1,-1,4,-19,160,-1405,17920,-231175,3942400,
 -67260025,1435033600,-30485899675,780658278400,
 -19861319603125,593300291584000,
 -17590824363487375,600419895083008000,
 -20332162643728560625,780545863607910400000,
 -29725015420426543091875,
 1267606482499246489600000]