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A012969 as a simple table

na(n)
01
10
24
3-6
419
5-140
6910
7-5250
839925
9-414360
104244200
11-42242750
12500292775
13-7036001700
1498944220050
15-1395690728250
1622347132003625
17-399376247582000
187158271817183500
19-130527261318021750

[1,0,4,-6,19,-140,910,-5250,39925,-414360,4244200,
 -42242750,500292775,-7036001700,98944220050,
 -1395690728250,22347132003625,-399376247582000,
 7158271817183500,-130527261318021750]